Address setting means for fire detectors

Claim 2

An addressible fire detector assembly for receiving address coded signals from a central control, said assembly comprising a base and a sensor, said base and said sensor having means which enable them to be fitted together to form said assembly, said base having passive means to define an address code, said sensor having means for reading said address code and for conditioning said sensor to receive said address coded signals from said central control.

Claim 3

An assembly according to claim 1 wherein said passive means comprises a plurality of elements in a particular arrangement in a given region, the reading means in the sensor being capable of detecting the presence or absence of said elements in said region.

Claim 4

An assembly according to claim 2 wherein said elements are mechanical elements.

Claim 5

An assembly according to claim 3 wherein the reading means includes switching elements which are operated by the mechanical elements where present.

Claim 6

An assembly according to claim 4 wherein the switching elements include a plurality of leaf springs mounted on a common conductive member, the sensor including a printed circuit having contact pads thereon which are engaged by the leaf springs that are operated by the mechanical elements where present.

Claim 7

An assembly according to claim 1 wherein the passive means comprise electrical contacts on said base, the reading means being provided with electrical contacts for making respective electrical connections with the contacts on the base and including circuitry which is responsive to said electrical connections in order to read the address code.

Claim 8

An assembly according to claim 1 wherein the passive means is arranged to represent a binary address code.

Claim 9

An addressible fire detector assembly according to claim 1 wherein the passive means are attached to a card-shaped member which is received in guides on the base, the card-shaped member having either a recess or key for cooperating with a respective key or recess on the sensor when the sensor is of a designated type to be fitted to the base, the arrangement also being such that a catch secures the member to the base when the member is fitted to the base and that the sensor makes the catch inaccessible when the sensor is fitted to the base.

Claim 10

An assembly according to claim 1 wherein the sensor includes a memory for storing the address code read from the passive means.

Claim 11

An addressible fire detector assembly according to claim 1 wherein the passive means are removably fitted to the base either individually or collectively.

Claim 12

An addressible fire detector assembly according to claim 10 wherein the passive means are part of a member which is secured against removal from the base when the member has been fitted to the base.

Claim 13

An addressible fire detector assembly according to claim 1 wherein the base is provided with means which cooperate with the sensor to enable only a sensor of a designated type to be fitted to the base.

Claim 14

An addressible fire detector assembly according to claim 12 wherein a part of said means is on a member to which the passive means are attached, said member being removably fitted to the base.

Claim 15

An addressible fire detector assembly for receiving address coded signals from a central control, said assembly comprising a base and a sensor having means which enable them to be fitted together to form said assembly, said base also having mechanical means for defining a bar code, said sensor having means for reading said bar code and for conditioning said sensor to receive said address coded signals.

Claim 16

An addressible fire detector assembly for receiving address coded signals from a central control, said assembly comprising a base and a sensor having means which enable them to be fitted together to form said assembly, said base also having mechanical means for defining a bar code, said sensor having means for reading said bar code and for conditioning said sensor to receive said address coded signals.

Claim 17

An addressible fire detector assembly for receiving address coded signals from a central control, said assembly comprising a base and a sensor, said base and said sensor having means which enable them to be fitted together to form said assembly, said base also having a plurality of address coding pins, said pins being spatially disposed for physically defining an address code to identify said assembly, said sensor having a plurality of switchable elements, which are spatially disposed for actuation by said address coding pins when said sensor is fitted to said base, said sensor further including circuitry responsive to said switching elements for reading and storing said address code whereby said assembly is conditioned to respond only to said address coded signals containing said address code defined by said pins.

Claim 18

An addressible fire detector assembly for receiving address coded signals from a central control, said assembly comprising a base and a sensor, said base and said sensor having means which enable them to be fitted together to form said assembly, said base also having a plurality of address coding pins, said pins being spatially disposed for physically defining an address code to identify said assembly, said sensor having a plurality of switchable elements, which are spatially disposed for actuation by said address coding pins when said sensor is fitted to said base, said sensor further including circuitry responsive to said switching elements for reading and storing said address code whereby said assembly is conditioned to respond only to said address coded signals containing said address code defined by said pins.

Claim 19

An addressible fire detector assembly according to claim 15 wherein said address coding pins are provided on a card, said card being removably fitted to said base, said base further including means for locating said card in a predetermined reading position at which said address code can be read.

Claim 20

An addressible fire detector assembly according to claim 16 wherein said card is provided with a predetermined edge profile and wherein said sensor is provided with abutment means to engage the predetermined edge profile of said card when said sensor is fitted to said base, said edge profile and said abutment means being disposed so as to enable only a sensor of a predetermined type to be fitted to said base in which said card is located in said reading position.