Electronic/electromechanical packaging arrangement for facility management system

Claim 2

A network unit for controlling the operation components of a facility management system, said unit comprising: a base frame having a front and a back, a number of control modules mounted on the front of said base frame, a power module mounted on the front of said base frame for each control module, a cage of the front of said base frame, a number of function modules mounted in a parallel spaced relation in said cage on the front of said base frame, a main printed wiring board assembly mounted on the back of said base frame for electrically interconnecting said function modules, control modules, and power modules, and a number of termination board assemblies mounted on said base frame for connecting the components of the facilities management system to said main wiring board assembly.

Claim 3

The unit according to claim 1, wherein said cage includes means for guiding said function modules into engagement with said main printed wiring board assembly.

Claim 4

The unit according to claim 2, wherein said guiding means comprises a row of slots on each side of said cage, each function module including a rib on each side, each rib matingly engaging one of said slots on each side of the cage to align said function modules in said cage.

Claim 5

The unit according to claim 3, including a lip on one side of said cage transverse to said slots and each of said function modules includes means for releasably locking said function module to said lip.

Claim 6

The unit according to claim 4, wherein said locking means comprises a latch pivotally mounted on each of said function modules for movement between open and closed positions with respect to said lip, said latch including a resilient extension for biasing said module into said cage when said extension engages said lip.

Claim 7

A network unit for controlling the operational components of a facility management system, said unit comprising: a base frame assembly, a number of control modules mounted on said assembly, a power module mounted on said assembly for each control module, a number of function modules mounted on said assembly, a main printed wiring board assembly for electrically interconnecting said termination board assemblies, function modules, control modules, and power modules, and said base frame assembly including a number of termination board assemblies, for connecting said network unit to the operational components of the system each of said function modules includes a wiring board, an electrical connector mounted on said wiring board, and means supporting said wiring board for longitudinal and lateral motion in said module.

Claim 8

A network unit for controlling the operational components of a facility management system, said unit comprising: a base frame assembly, a number of control modules mounted on said assembly, a power module mounted on said assembly for each control module, a number of function modules mounted on said assembly, a main printed wiring board assembly for electrically interconnecting said termination board assemblies, function modules, control modules, and power modules, and said base frame assembly including a number of termination board assemblies, for connecting said network unit to the operational components of the system each of said function modules includes a wiring board, an electrical connector mounted on said wiring board, and means supporting said wiring board for longitudinal and lateral motion in said module.

Claim 9

The unit according to claim 6, wherein said main printed wiring board assembly includes an electrical receptacle for each function module, each of said receptacles includes means for camming said electrical connectors in said function modules into alignment with said electrical receptacles.

Claim 10

A network unit for controlling the operational components of a facility management system, said unit comprising: a base frame, a number of control modules mounted on said base frame, a power module mounted on said base frame for each control module, a number of function modules mounted on said base frame, a main printed wiring board assembly for electrically interconnecting said function modules, control modules, and power modules, and including a number of termination board assemblies mounted on said base frame for connecting the operational components of the facility management system to said main wiring board assembly and wherein said base frame includes a number of slots and a hook at one end of each of said slots and a loop at the other end of each of said slots, and each of said control modules includes means for pivotally engaging said hook and means for locking said modules to said loop.

Claim 11

A network unit for controlling the operational components of a facility management system, said unit comprising: a base frame, a number of control modules mounted on said base frame, a power module mounted on said base frame for each control module, a number of function modules mounted on said base frame, a main printed wiring board assembly for electrically interconnecting said function modules, control modules, and power modules, and including a number of termination board assemblies mounted on said base frame for connecting the operational components of the facility management system to said main wiring board assembly and wherein said base frame includes a number of slots and a hook at one end of each of said slots and a loop at the other end of each of said slots, and each of said control modules includes means for pivotally engaging said hook and means for locking said modules to said loop.

Claim 12

The unit according to claim 8 wherein said locking means includes a latch for engaging said loop and a lock for engaging said latch to prevent release of said latch from said loop.

Claim 13

A network unit for controlling the operational components of a facility management system, said unit comprising: a base frame, a number of control modules mounted on said base frame, a power module mounted on said base frame for each control module, a number of function modules mounted on said base frame, a main wiring board assembly for electrically interconnecting said function modules, control modules, and power modules, and including a number of termination board assemblies for connecting the operational components of the facility management system to said main wiring board assembly and wherein said main wiring board assembly includes a printed wiring board, an insulation shield mounted on each side of said wiring board and a ground shield mounted on the outside of each of said insulation shields.

Claim 14

A network unit for controlling the operational components of a facility management system, said unit comprising: a base frame, a number of control modules mounted on said base frame, a power module mounted on said base frame for each control module, a number of function modules mounted on said base frame, a main wiring board assembly for electrically interconnecting said function modules, control modules, and power modules, and including a number of termination board assemblies for connecting the operational components of the facility management system to said main wiring board assembly and wherein said main wiring board assembly includes a printed wiring board, an insulation shield mounted on each side of said wiring board and a ground shield mounted on the outside of each of said insulation shields.

Claim 15

The unit according to claim 10 wherein said printed wiring board includes a first set of electrical connectors for engaging said function modules, a second set of electrical connectors for engaging said control modules and a third set of electrical connectors for engaging said power modules.

Claim 16

The unit according to claim 11 wherein said base frame includes a single frame having means on one side of said frame for forming a ground shield around of said second and third sets of electrical connectors.

Claim 17

The unit according to claim 12, wherein said ground shield forming means comprises a number of grooves in said frame and an electrically conductive braid in each of said grooves, said main printed wiring board ground shield including a number of tabs projecting through said frame into electrical communication with said conductive braid in said grooves.

Claim 18

The unit according to claim 10 including an enclosure for housing said network control unit, said enclosure including a casing and a removable cover for providing access to said network control unit and a door in said cover for providing access to said modules.

Claim 19

The unit according to claim 14 including means for locking said cover to said casing and said door to said cover, said locking means including a first key movable in the direction for opening said cover and a second key movable in the other direction for opening said door.

Claim 20

The unit according to claim 15 including a cradle mounted in said casing, a network terminal mounted in said cradle and being operably connected to one of said control modules and an opening in said cover for providing access to said network terminal.

Claim 21

The unit according to claim 16 wherein said cradle includes means for releasably locking said network terminal in said cradle.

Claim 22

The unit according to claim 17 wherein said locking means is positioned to engage said door when said door is closed whereby said locking means cannot be opened when said door is closed.

Claim 23

A network control unit for connecting the communication buses for a facility management system to the operational components of the system, said unit comprising: a molded one piece base frame having a front and a back, a power assembly and a communication termination board assembly mounted on the front of said frame, a number of termination board assemblies mounted on the front of said frame, a number of function modules removably mounted on the front of said frame, a number of control modules removably mounted on the front of said frame, a number of power modules removably mounted on said frame, a main printed wiring board assembly mounted on the back of said frame for operatively connecting said modules to said termination board assemblies, power assembly and communication termination board assembly and means on said frame for grounding said control modules and said power modules to said main printed wiring board assembly, said grounding means comprising a number of grooves in the front of said frame, and an electrically conductive braid in each of said grooves, said wiring board assembly including a ground shield operably connected through said frame to said braid whereby each of said control and power modules are connected to ground.

Claim 24

A network control unit for connecting the communication buses for a facility management system to the operational components of the system, said unit comprising: a molded one piece base frame having a front and a back, a power assembly and a communication termination board assembly mounted on the front of said frame, a number of termination board assemblies mounted on the front of said frame, a number of function modules removably mounted on the front of said frame, a number of control modules removably mounted on the front of said frame, a number of power modules removably mounted on said frame, a main printed wiring board assembly mounted on the back of said frame for operatively connecting said modules to said termination board assemblies, power assembly and communication termination board assembly and means on said frame for grounding said control modules and said power modules to said main printed wiring board assembly, said grounding means comprising a number of grooves in the front of said frame, and an electrically conductive braid in each of said grooves, said wiring board assembly including a ground shield operably connected through said frame to said braid whereby each of said control and power modules are connected to ground.

Claim 25

The unit according to claim 19 wherein said main printed wiring board assembly includes: a first set of electrical connectors for connecting said function modules to said main wiring board assembly, a second set of electrical connectors for connecting said control modules to said main wiring board assembly, and a third set of electrical connectors for connecting said power modules to said main wiring board assembly.

Claim 26

The unit according to claim 20 including first means on said frame for guiding said function modules into electrical engagement with said first set of electrical connectors, second means on said frame for guiding said control modules into electrical engagement with said second set of electrical connectors, and third means on said frame for guiding said power modules into electrical engagement with said third set of connectors.

Claim 27

The unit according to claim 20 wherein each of said function modules includes a printed circuit board having an electrical connector at one end, means within said module supporting said board for lateral and longitudinal movement with respect to said function module and means on said printed circuit board for guiding said electrical connector into engagement with one of said first set of electrical connectors on installation of said function module into said frame.

Claim 28

The unit according to claim 22 wherein said frame includes a recess along one side of said first set of electrical connectors, and said function module includes a latch pivotally mounted on said module for movement between open and closed positions, said latch including a resilient extension positioned to engage said recess to bias said module into engagement with one of said first set of connectors when said latch is in the closed position.

Claim 29

The unit according to claim 20 wherein said frame includes a hook at one end of each of said second and third sets of electrical connectors and a loop at the other end of each of said second and third sets of electrical connectors and said control modules and power modules each include a recess at one end for pivotally engaging said hooks and means at the other end of said modules for securing said modules to said loops, said modules being free to move laterally and longitudinally on said hooks on movement into engagement with said electrical connectors

Claim 30

The unit according to claim 24 wherein said securing means includes a latch for engaging said loop and a lock for securing said latch to said loop.

Claim 31

The unit according to claim 25 wherein each of said control modules and power modules includes a printed circuit board having an electrical connector mounted thereon, said modules each including means for guiding said connectors into engagement with said second and third set of connectors.

Claim 32

The network control unit according to claim 19 including an enclosure for said network control unit, said enclosure including a casing and a cover removably mounted on said casing, a door mounted on said cover to provide access to said modules, and means for selectively locking said cover to said casing and said door to said cover.

Claim 33

The network control unit according to claim 27 wherein said locking means is rotated clockwise for unlocking said cover and is rotated counterclockwise unlocking said door.

Claim 34

A network control unit for connecting the communication buses for a facility management system to the operational components of the system, said unit comprising: a one piece base frame having a front and a back, a power assembly and a communication termination board assembly mounted on the front of said base frame, a number of termination board assemblies mounted on the front of said frame, a number of function modules removably mounted on the front of said frame, a number of control modules removably mounted on the front of said frame, a number of power modules removably mounted on the front of said frame and a main printed wiring board assembly mounted on the back of said frame for operatively connecting said modules to said termination board assemblies, power assembly and communication termination board assembly, a cradle mounted on said frame and a network terminal removably mounted in said cradle and being operably connected to one of said control modules.

Claim 35

A network control unit for connecting the communication buses for a facility management system to the operational components of the system, said unit comprising: a one piece base frame having a front and a back, a power assembly and a communication termination board assembly mounted on the front of said base frame, a number of termination board assemblies mounted on the front of said frame, a number of function modules removably mounted on the front of said frame, a number of control modules removably mounted on the front of said frame, a number of power modules removably mounted on the front of said frame and a main printed wiring board assembly mounted on the back of said frame for operatively connecting said modules to said termination board assemblies, power assembly and communication termination board assembly, a cradle mounted on said frame and a network terminal removably mounted in said cradle and being operably connected to one of said control modules.

Claim 36

The network control unit according to claim 29 wherein said cradle includes means for releasably locking said network terminal in said cradle.

Claim 37

A function module for a network control unit having a frame, a pair of parallel walls on said frame for defining a function module cage and a set of function module connectors mounted in a parallel spaced relation between the walls of the cage, said function module comprising: a cartridge adapted to be mounted on the frame between the walls, a wiring board mounted in said cartridge, said wiring board including an electrical connector on one end, first means supporting said wiring board for longitudinal movement in said cartridge, second means supporting said board for lateral movement in said cartridge, and means on said wiring board for camming said electrical connector on said wiring board into engagement with one of the function module connectors when said cartridge is mounted in the cage.

Claim 38

A function module for a network control unit having a frame, a pair of parallel walls on said frame for defining a function module cage and a set of function module connectors mounted in a parallel spaced relation between the walls of the cage, said function module comprising: a cartridge adapted to be mounted on the frame between the walls, a wiring board mounted in said cartridge, said wiring board including an electrical connector on one end, first means supporting said wiring board for longitudinal movement in said cartridge, second means supporting said board for lateral movement in said cartridge, and means on said wiring board for camming said electrical connector on said wiring board into engagement with one of the function module connectors when said cartridge is mounted in the cage.

Claim 39

The module according to claim 31 wherein each of the walls includes a slot at each end of the function module connectors, and said cartridge includes a rib on each side located in a position to engage the slots in the walls for guiding said module into engagement with the function module connector in the cage.

Claim 40

The module according to claim 32 wherein one of the walls includes a lip and said module includes means for engaging the lip to bias said modules into engagement with the function module connectors.

Claim 41

The module according to claim 33 wherein said engaging means comprises a latch pivotally mounted on said cartridge for movement between open and closed positions and a resilient extension on said latch for engaging the lip when said latch is in the closed position.

Claim 42

A network control unit for controlling the operational components of a facility management system, said unit comprising: a monolithic base frame having a front and a back, a main wiring board assembly mounted on the back of said frame, said main wiring board assembly including a first set of electrical connectors projecting through said frame, a second set of electrical connectors projecting through said frame, and a third set of electrical connectors projecting through said frame, one or more plug-in type function modules mounted on said first set of connectors on the front of said frame, one or more plug-in type control modules mounted on said second set of connectors on the front of said frame, one or more plug-in type power modules mounted on said third set of connectors on the front of said frame, and means on said wiring board assembly for electrically interconnecting said modules, said function modules each include a wiring board having an electrical connector at one end, and means in said modules supporting said wiring board for three directional movement with respect to said first set of connectors.

Claim 43

A network control unit for controlling the operational components of a facility management system, said unit comprising: a monolithic base frame having a front and a back, a main wiring board assembly mounted on the back of said frame, said main wiring board assembly including a first set of electrical connectors projecting through said frame, a second set of electrical connectors projecting through said frame, and a third set of electrical connectors projecting through said frame, one or more plug-in type function modules mounted on said first set of connectors on the front of said frame, one or more plug-in type control modules mounted on said second set of connectors on the front of said frame, one or more plug-in type power modules mounted on said third set of connectors on the front of said frame, and means on said wiring board assembly for electrically interconnecting said modules, said function modules each include a wiring board having an electrical connector at one end, and means in said modules supporting said wiring board for three directional movement with respect to said first set of connectors.

Claim 44

The unit according to claim 35 wherein each of said function module wiring boards include means for guiding said electrical connectors into engagement with said first set of connectors.

Claim 45

A network control unit for controlling the operational components of a facility management system, said unit comprising: a base frame assembly including a monolithic frame having a front and a back, p1 a main wiring board assembly mounted on the back of said frame, said main wiring board assembly including a first set of electrical connectors projecting through said frame, a second set of electrical connectors projecting through said frame, and a third set of connectors projecting through said frame, one or more plug-in type function modules mounted on said first set of connectors on the front of said frame, one or more plug-in type control modules mounted on said second set of connectors on the front of said frame, one or more plug-in type power modules mounted on said third set of connectors on the front of said frame, and means on said wiring assembly electrically interconnecting said modules wherein said frame includes a hook on one end and a loop at the other end of each of said second and third sets of connectors and each of said control modules and power modules includes means for pivotally engaging said hook and means for manually securing said modules to said loops.

Claim 46

A network control unit for controlling the operational components of a facility management system, said unit comprising: a base frame assembly including a monolithic frame having a front and a back, p1 a main wiring board assembly mounted on the back of said frame, said main wiring board assembly including a first set of electrical connectors projecting through said frame, a second set of electrical connectors projecting through said frame, and a third set of connectors projecting through said frame, one or more plug-in type function modules mounted on said first set of connectors on the front of said frame, one or more plug-in type control modules mounted on said second set of connectors on the front of said frame, one or more plug-in type power modules mounted on said third set of connectors on the front of said frame, and means on said wiring assembly electrically interconnecting said modules wherein said frame includes a hook on one end and a loop at the other end of each of said second and third sets of connectors and each of said control modules and power modules includes means for pivotally engaging said hook and means for manually securing said modules to said loops.

Claim 47

A function module for a network control unit including a monolithic frame having a front and a back and a main wiring board assembly mounted on the back of the frame, said wiring board assembly including a number of function module connectors mounted thereon, said module comprising: a circuit board assembly mounted in said cartridge, said circuit board assembly including an electrical connector mounted on one end in a position to engage one of the function module connectors on the main circuit board assembly, means on said cartridge for securing said cartridge to the frame and means in said cartridge supporting said circuit board assembly for three directional movement with respect to the electrical connectors on the main circuit board assembly.

Claim 48

A function module for a network control unit including a monolithic frame having a front and a back and a main wiring board assembly mounted on the back of the frame, said wiring board assembly including a number of function module connectors mounted thereon, said module comprising: a circuit board assembly mounted in said cartridge, said circuit board assembly including an electrical connector mounted on one end in a position to engage one of the function module connectors on the main circuit board assembly, means on said cartridge for securing said cartridge to the frame and means in said cartridge supporting said circuit board assembly for three directional movement with respect to the electrical connectors on the main circuit board assembly.

Claim 49

The module according to claim 38 wherein said securing means comprises a latch pivotally mounted on said cartridge for movement between open and closed positions with respect to the frame, said latch including a resilient arm positioned to engage the frame to bias the cartridge into engagement with the electrical connector on the main wiring board assembly when said latch is in the closed position.

Claim 50

The module according to claim 39 wherein said latch includes means for locking the latch to the cartridge in the closed position.

Claim 51

A function module for a network control unit having a monolithic frame and a main wiring board assembly mounted on the frame, said wiring board assembly including a number of electrical connectors mounted thereon, said module comprising: a cartridge, a circuit board assembly mounted in said cartridge, said circuit board assembly including an electrical connector at one end positioned to engage one of the electrical connectors on the main circuit board assembly, and means on said cartridge for securing said cartridge to said frame and including a pair of switches mounted on said circuit board assembly, a cap mounted on said switches and means mounted on said circuit board assembly and operably connected to said cap for selectively activating said switches.

Claim 52

A function module for a network control unit having a monolithic frame and a main wiring board assembly mounted on the frame, said wiring board assembly including a number of electrical connectors mounted thereon, said module comprising: a cartridge, a circuit board assembly mounted in said cartridge, said circuit board assembly including an electrical connector at one end positioned to engage one of the electrical connectors on the main circuit board assembly, and means on said cartridge for securing said cartridge to said frame and including a pair of switches mounted on said circuit board assembly, a cap mounted on said switches and means mounted on said circuit board assembly and operably connected to said cap for selectively activating said switches.

Claim 53

An electronic cartridge adapted to be connected to a frame, the frame having a cage formed thereon for receiving said cartridge, a first set of electrical connectors mounted in the cage in the frame, said cartridge comprising a housing of a shape to fit into the cage, a printed circuit board mounted within said housing and having electronic components thereon, a second electrical connector mounted at one end of said circuit board and being connected to said electronic components, said second electrical connector being adapted to mate with one of said first set of electrical connectors upon said cartridge being inserted into said cage and a lever mounted on said housing and being moveable between first and second positions, said lever including locking means adapted to engage the cage to hold said cartridge in said cage with said second electrical connector connected to one of the first set of connectors, said cartridge including means supporting said printed circuit board for longitudinal and lateral motion with respect to the first electrical connectors, and means for camming said printed circuit board into alignment with the first electrical connectors.

Claim 54

An electronic cartridge adapted to be connected to a frame, the frame having a cage formed thereon for receiving said cartridge, a first set of electrical connectors mounted in the cage in the frame, said cartridge comprising a housing of a shape to fit into the cage, a printed circuit board mounted within said housing and having electronic components thereon, a second electrical connector mounted at one end of said circuit board and being connected to said electronic components, said second electrical connector being adapted to mate with one of said first set of electrical connectors upon said cartridge being inserted into said cage and a lever mounted on said housing and being moveable between first and second positions, said lever including locking means adapted to engage the cage to hold said cartridge in said cage with said second electrical connector connected to one of the first set of connectors, said cartridge including means supporting said printed circuit board for longitudinal and lateral motion with respect to the first electrical connectors, and means for camming said printed circuit board into alignment with the first electrical connectors.

Claim 55

A network control unit for coordinating the operation of the operational components of a building, said unit comprising: a base frame assembly including, a main printed wiring board mounted on one side of said frame, a number of termination board assemblies mounted on the other side of said frame for electrically connecting the incoming and outgoing cables for the various operational components to said main wiring board assembly, a number of function modules, control modules and power modules removably mounted on the other side of said frame, a communication termination board assembly mounted on the other side of said frame; a power termination board mounted on the other side of said frame, and a preload resistor mounted on said other side of said frame, said wiring board assembly operatively interconnecting said modules, termination board assemblies, communication termination board assembly, power termination board and preload resistor whereby all of the operational components of the building are coordinated through the network control unit, said wiring board assembly including means for grounding said control modules, power modules, communication termination board assembly, power termination board and preload resistor when mounted on said frame and said frame including a base, a function module cage on said base and means in said cage for aligning said function modules in a parallel spaced relation on said base.

Claim 56

A network control unit for coordinating the operation of the operational components of a building, said unit comprising: a base frame assembly including, a main printed wiring board mounted on one side of said frame, a number of termination board assemblies mounted on the other side of said frame for electrically connecting the incoming and outgoing cables for the various operational components to said main wiring board assembly, a number of function modules, control modules and power modules removably mounted on the other side of said frame, a communication termination board assembly mounted on the other side of said frame; a power termination board mounted on the other side of said frame, and a preload resistor mounted on said other side of said frame, said wiring board assembly operatively interconnecting said modules, termination board assemblies, communication termination board assembly, power termination board and preload resistor whereby all of the operational components of the building are coordinated through the network control unit, said wiring board assembly including means for grounding said control modules, power modules, communication termination board assembly, power termination board and preload resistor when mounted on said frame and said frame including a base, a function module cage on said base and means in said cage for aligning said function modules in a parallel spaced relation on said base.

Claim 57

The assembly according to claim 43 wherein said base includes a number of slots located in a parallel spaced relation and said wiring board assembly includes an electrical connector corresponding to each of said slots and means on said base for securing said control and power modules to said base with said modules electrically connected to said connectors.

Claim 58

The assembly according to claim 44 wherein said securing means comprises a hook at one end and a loop at the other end of each of said slots and said modules include means for pivotally engaging said hooks and means for locking said modules to said loops.

Claim 59

The unit according to claim 43 wherein said wiring board assembly includes a ground shield between said other side of said frame and said main wiring board assembly, said control modules and power modules include electrically conductive cartridges, and said frame includes a plurality of grooves in said other side of said frame, an electrically conductive braid in each of said grooves for engaging said cartridges when mounted on said frame, and means for connecting said braid to said ground shield on said main wiring board assembly.

Claim 60

The unit according to claim 46 wherein said connecting means comprises a plurality of tabs in said ground shield which project through said frame into said braid.

Claim 61

The unit according to claim 46 wherein said main printed wiring board assembly includes means for grounding said termination board assemblies, communication termination board assembly, power termination board and preload resistor.

Claim 62

A network control unit for monitoring and controlling all of the operational components of a building, said unit comprising: a modular base frame having a front and a back, a wiring board assembly mounted on the back of said base frame, a number of termination board assemblies mounted on the front of said base frame and being operably connected to said wiring board assembly, a function module mounted on the front of said base frame and being operably connected to said wiring board assembly, a digital control module mounted on the front of said base frame and being operably connected to said wiring board assembly, an expansion module mounted on the front of said base frame and being operably connected to said wiring board assembly, a network control module mounted on the front of said base frame and being operably connected to said wiring board assembly, a power module mounted on the front of said base frame for each digital, expansion and network module mounted on said base frame, each power module being operably connected to said wiring board assembly, a power termination board mounted on said base frame and being operably connected to said wiring board assembly, a communication termination board mounted on said base frame and being operably connected to said network control module whereby input signals from the operational components are monitored by said modules through the wiring board assembly and output signals from said modules are transmitted through the wiring board assembly to the operational components and means for grounding said digital, expansion, control and power modules, and said communication termination board and said power termination board, through said wiring board assembly, said grounding mans including an electrically conductive braid in the front of said frame.

Claim 63

A network control unit for monitoring and controlling all of the operational components of a building, said unit comprising: a modular base frame having a front and a back, a wiring board assembly mounted on the back of said base frame, a number of termination board assemblies mounted on the front of said base frame and being operably connected to said wiring board assembly, a function module mounted on the front of said base frame and being operably connected to said wiring board assembly, a digital control module mounted on the front of said base frame and being operably connected to said wiring board assembly, an expansion module mounted on the front of said base frame and being operably connected to said wiring board assembly, a network control module mounted on the front of said base frame and being operably connected to said wiring board assembly, a power module mounted on the front of said base frame for each digital, expansion and network module mounted on said base frame, each power module being operably connected to said wiring board assembly, a power termination board mounted on said base frame and being operably connected to said wiring board assembly, a communication termination board mounted on said base frame and being operably connected to said network control module whereby input signals from the operational components are monitored by said modules through the wiring board assembly and output signals from said modules are transmitted through the wiring board assembly to the operational components and means for grounding said digital, expansion, control and power modules, and said communication termination board and said power termination board, through said wiring board assembly, said grounding mans including an electrically conductive braid in the front of said frame.

Claim 64

The network control unit according to claim 49 wherein said digital, expansion and control modules each include an electrically conductive casing positioned to engage said braid.