US5265093A — Hardware interface and protocol for a mobile radi…

Claim 1

Independent Claim 161 words

A radio peripheral device for communicating with a digital radio frequency transceiver using at least one shared serial data link and at least one service request control line, said peripheral device including: means coupled to said service request control line for applying a signal to said service request control line informing said transceiver that a digital message is to be communicated to said transceiver; and poll handling means coupled to said serial data link for receiving a poll message from said transceiver, said poll message being responsive to said applied service request control line signal, said poll message granting said peripheral device access to send said digital message to said transceiver via said serial data link, and for sending said digital message to said transceiver over said serial data link, wherein said digital message includes a message type field specifying a message type, a unit identification code, a data type field, a data byte number, and at least one data byte.

Claim 2

Dependent Claim 161 words

A radio peripheral device for communicating with a digital radio frequency transceiver using at least one shared serial data link and at least one service request control line, said peripheral device including: means coupled to said service request control line for applying a signal to said service request control line informing said transceiver that a digital message is to be communicated to said transceiver; and poll handling means coupled to said serial data link for receiving a poll message from said transceiver, said poll message being responsive to said applied service request control line signal, said poll message granting said peripheral device access to send said digital message to said transceiver via said serial data link, and for sending said digital message to said transceiver over said serial data link, wherein said digital message includes a message type field specifying a message type, a unit identification code, a data type field, a data byte number, and at least one data byte.

Claim 3

Dependent Claim 131 words

Apparatus as in claim 1 wherein said transceiver includes: means for receiving a status message passed over said link, said status message including a bit indicating whether a digital radio frequency control channel is active and a plurality of bits identifying a vehicular repeater; means receiving a call processing message applied to said link, said call processing message including at least one bit verifying that a logical identification code of a calling unit requesting call processing is valid, a push-to-talk bit requesting said vehicular repeater to transmit, an EMER bit specifying the priority of said transmission, and said plurality of bits identifying said vehicular repeater; and means for transmitting radio frequency signals at said specified priority over a radio frequency communications channel in response to receipt of said call processing message.

Claim 4

Dependent Claim 93 words

Apparatus as in claim 1 wherein said transceiver includes: means for receiving radio frequency signals; means for producing an audio signal in response to said received radio frequency signals; means responsive to receipt of said radio frequency signals for applying a call processing message to said serial data link, said call processing message including: (a) a bit controlling routing said audio signals to a speaker, (b) a bit indicating whether said received signals have emergency status, (c) a bit controlling said transceiver to transmit, and (d) plurality of bits identifying said vehicular repeater.

Claim 5

Dependent Claim 189 words

Apparatus as in claim 1 wherein said device further includes: means for serially receiving a transfer control message over a serial data link, said message including: (a) an S bit value selecting between a new call transfer request and a status change, (b) plural bit values specifying a preset identification code of a calling radio unit if a new call transfer request is specified by said S bit value, (c) an RTS bit value requesting a data transfer from said transceiver to said mobile data terminal, (d) an ABT bit value specifying if a current data transfer is to be prematurely aborted, (e) a TXC bit value specifying if all data has already been transferred, and (f) a DST port number value specifying a destination data port for receiving a data transfer; means for testing said RTS bit value; and means responsive to said testing means and the results of said testing performed thereby for generating a message in response to said received transfer control message indicating the number of data bytes to be transferred if said testing reveals that RTS bit value indicates a data transfer is requested.

Claim 6

Dependent Claim 196 words

Apparatus as in claim 1 wherein said device includes: means for generating a transfer control message including: (a) an S bit value selecting between a new call transfer request and a status change, (b) plural bit values specifying a preset identification code of at least one radio unit to be called if a call request is specified by said S bit value, said plural bit values including at least one G bit specifying whether said identification code corresponds to an individual radio unit or to a group of radio units, (c) an ENC bit value for specifying encrypted mode, (d) a PRIO bit value specifying the priority of the requested call, (e) an RTS bit value for requesting a transfer of data to said transceiver, (f) an ABT bit value which is set only if a data transfer is to be aborted, (g) a TXC bit value which is set if all data has already been transferred, and (h) an SEL bit value which is set if said transceiver is to select said identification code without originating a radio call; and means for serially transmitting said generated message to said transceiver over a serial data link.

Claim 7

Dependent Claim 110 words

Apparatus as in claim 1 wherein said device further includes: character generating means for generating: a control character specifying the form of data transfer, a character e indicating whether said digital data is encrypted, characters s, d identifying a source and a destination port, respectively, a character t identifying a type of radio transmission used to convey said digital data, and plural characters identifying radio unit(s) originating and/or to receive said digital data; means coupled to said character generating means for passing said generated characters over said serial data link; and means for transferring digital data over said serial data link in the form specified by said generated control character.

Claim 8

Dependent Claim 158 words

Apparatus as in claim 1 wherein: said peripheral device comprises a vehicular radio frequency repeater; and said device further comprises: means connected to said link for receiving a status message passed over said link, said status message including a bit indicating whether a digital radio frequency control channel is active and a plurality of bits identifying said vehicular repeater; means connected to said link for receiving a call processing message applied to said link, said call processing message including at least one bit verifying that a logical identification code of a calling unit requesting call processing is valid, a push-to-talk bit requesting said vehicular repeater to transmit, an EMER bit specifying the priority of said transmission, and said plurality of bits identifying said vehicular repeater; and means connected to both of said receiving means for repeating radio frequency signals at said specified priority over a radio frequency communications channel in response to receipt of said call processing message.

Claim 9

Dependent Claim 125 words

Apparatus as in claim 1 wherein said peripheral device comprises a vehicular radio frequency repeater adapted for connection to a mobile radio frequency transceiver via a serial data bus, said repeater including: means for receiving radio frequency signals transmitted by a portable radio transceiver; means for producing an audio signal in response to said received radio frequency signals; and means for applying a call processing message to said serial data link in response to receipt of said radio frequency signals, said call processing message including: (a) a bit controlling routing of said audio signals to a speaker, (b) a bit indicating whether said received signals have emergency status, (c) at bit controlling said transceiver to transmit, and (d) plurality of bits identifying said vehicular repeater.

Claim 10

Dependent Claim 187 words

Apparatus as in claim 1 further including: means adapted for connection to a serial data link for serially receiving a transfer control message over said serial data link, said message including: (a) an S bit value selecting between a new call transfer request and a status change, (b) plural bit values specifying a preset identification code of a calling radio unit if a new call transfer request is specified by said S bit value, (c) an RTS bit value requesting a data transfer from said transceiver to said mobile data terminal, (d) an ABT bit value specifying if a current data transfer is to be prematurely aborted, (e) a TXC bit value specifying if all data has already been transferred, and (f) a DST port number value specifying a destination data port for receiving a data transfer; means connected to said receiving means for testing said RTS bit value; and means for generating a message in response to said received transfer control message indicating the number of data bytes to be transferred if said testing means reveals the RTS bit value indicates a data transfer is requested.

Claim 11

Dependent Claim 200 words

Apparatus as in claim 1 further including: means for generating a transfer control message including: (a) an S bit value selecting between a new call transfer request and a status change, (b) plural bit values specifying a preset identification code of at least one radio unit to be called if a call request is specified by said S bit value, said plural bit values including at least one bit G bit specifying whether said identification code corresponds to an individual radio unit or to a group of radio units, (c) an ENC bit value for specifying encrypted mode, (d) a PRI bit value specifying the priority of the requested call, (e) in RTS bit value for requesting a transfer of data to said transceiver, (f) an ABT bit value which is set only if a data transfer is to be aborted, (g) a TXC bit value which is set if all data has already been transferred, and (h) an SEL bit value which is set if said transceiver is to select said identification code without originating a radio call; and means connected to said generating means for serially transmitting said generated message to said transceiver over a serial data link.

Claim 12

Dependent Claim 129 words

Apparatus as in claim 1 wherein said peripheral device further includes: data generating means for generating: a control character specifying the form of data transfer, a character e indicating whether said digital data is encrypted, characters s, d identifying a source and a destination port, respectively, a character t identifying a type of radio transmission used to convey said digital data, and plural characters identifying radio unit(s) originating and/or to receive said digital data; means connected to said generating means and to said first serial data link for passing said generated characters in sequence serially over said first serial data link; and means connected to said link for transferring digital data over said serial data link in the form specified by said control character generated by said generating means.

Claim 13

Dependent Claim 145 words

An arrangement for facilitating digital communications between a digitally trunked radio transceiver and an option device locally connected thereto, said arrangement comprising: a service request line connection coupling said option device to said transceiver; a shared serial data line connection coupling said option device to said transceiver; and communications control means coupled to said service request line connection and to said serial data line connection, said communications control means for inducing an active signal level on said service request line connection, for receiving a responsive polling message from said transceiver via said serial data line connection, said received poll message granting access rights to said serial data link, for applying at least one data message to said serial data line connection in response to receipt of said polling message, and for subsequently ceasing to induce said active signal level on said service request line connection.

Claim 14

Dependent Claim 145 words

An arrangement for facilitating digital communications between a digitally trunked radio transceiver and an option device locally connected thereto, said arrangement comprising: a service request line connection coupling said option device to said transceiver; a shared serial data line connection coupling said option device to said transceiver; and communications control means coupled to said service request line connection and to said serial data line connection, said communications control means for inducing an active signal level on said service request line connection, for receiving a responsive polling message from said transceiver via said serial data line connection, said received poll message granting access rights to said serial data link, for applying at least one data message to said serial data line connection in response to receipt of said polling message, and for subsequently ceasing to induce said active signal level on said service request line connection.

Claim 15

Dependent Claim 16 words

An arrangement as in claim 12 wherein said option device comprises a mobile data terminal interface.

Claim 16

Dependent Claim 26 words

An arrangement as in claim 12 wherein said service request line connection and said serial data line connection are coupled to plural locally connected option devices.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1996-11-22	1997-05-24	1997-11-23	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2000-11-22	2001-05-24	2001-11-23	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2004-11-22	2005-05-24	2005-11-23	$7700.00	Window Closed / Lapsed

Hardware interface and protocol for a mobile radio transceiver

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