CalAmp 09002 Users Manual

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

Interface Specification

Standard Communications Corp.
1111 Knox St.
Torrance, CA 90502
800-767-2831

CRM4250/4200

Cellular Radio Module

Company Confidential

Standard Communications Corp. -1- November 20, 2000

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

Preliminary Draft - subject to change without notice

Document Changes:

Initial Release: Rev. - 11/20/00

Company Confidential

Standard Communications Corp. -2- November 20, 2000

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

1.0. SYSTEM OVERVIEW 4

2.0. GENERAL DESCRIPTION 4

3.0. INTERFACE SPECIFICATION 4

3.1 GENERAL 4

3.2 PHYSICAL 5

3.3 ELECTRICAL 6

3.4. SERIAL DATA FORMAT 6

4.0 SERIAL CONTROL PROTOCOL 7

4.1. PACKET STRUCTURE 7

4.2. DATA TRANSPARENCY 7

4.3. MESSAGE FLOW 7

6.0. DETAILED COMMAND DESCRIPTIONS 9

6.1. LABELING CONVENTIONS FOR SYNTAX: 9

6.2. GENERAL COMMANDS 9

7.0 CONTROL MESSAGE FLOW DIAGRAMS 26

7.1 INITIAL POWER-UP SEQUENCE 26

7.2 POWER-DOWN SEQUENCE 26

7.3 CHANGE OPERATING MODE 26

8.0 POWER MANAGEMENT 27

Company Confidential

Standard Communications Corp. -3- November 20, 2000

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

1.0. SYSTEM OVERVIEW

The Standard Communications CRM4250/4200 Cellular Radio Module is part of a
two-piece solution for wireless data communications. The CRM4250/4200 unit is
used in conjunction with a separate modem unit to provide a complete solution. This
architecture allows use of multiple radio and other media interface modules with a
common multi-standard modem unit.

2.0 GENERAL DESCRIPTION

The CRM4250/4200 contains all of the functional elements of a complete cellular
telephone with the exception of the user interface and the battery. The unit includes a
complete receiver and transmitter; plus, a micro controller and other circuitry to
allow the unit to efficiently interface to an external modem unit.

3.0. INTERFACE SPECIFICATION

3.1 General

The CRM4250/4200 interface is designed to allow simple interfacing between
various modems and radio modules. It is designed to be hardware and standard
independent on both the radio and the modem sides of the interface. This interface
has been submitted to the PCMCIA committee for adoption as an extension to the
PCMCIA modem card auxiliary connector standard.

The interface command set includes operating modes to support many different radio
system standards. At present, the standards defined for the interface include AMPS
cellular telephone. Products utilizing this interface may support one or more of these
operating modes and will have the ability to query the personality of a given module
and to set the operating mode of a multiple mode module.

Company Confidential

Standard Communications Corp. -4- November 20, 2000

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

3.2 Physical

The host interface to the CRM4250/4200 is implemented using a 20 pin (2x10) header
connector. It provides all connections between the CRM4250/4200 and the base band
controller and/or data modem.

PIN SMBOL I/O DESCRIPTION
1,2 GND GND Ground.
3 SPKR OUT O High Power Audio (Ear/Speaker)
4 LINE A O RX demodulated signal (+)

+/-8.0kHz deviation input will produce
1 volt p-p output signal (variable level

with 99h command) for modem use.
5 SPKR OUT O High Power Audio (Ringer).
6 LINE IN I TX modulation (+)

1 volt p-p signal,

will produce +/-8.0kHz deviation.

Single-ended input (600 ohm)
7 LINE B O Fixed -18dBm modem audio output.
8 MIC I Microphone audio input. Can be

directly connected to 600 ohm

impedance microphone or Electric

type microphone.
9,10 VCC PWR (CRM4200 ONLY) +5 VDC supply input.

Requires a minimum available current of

750mA. (DO NOT CONNECT IF CRM4250)
11 reserved - Do not connect.
12 RSSI O Receive signal strength indication.

Varying DC voltage output based on
received signal strength.

13,14 VCC PWR (CRM4250 ONLY) +12VDC supply input

Requires a minimum available current of

1.2 amps. (DO NOT CONNECT IF CRM4200)

Company Confidential

Standard Communications Corp. -5- November 20, 2000

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

PIN SMBOL I/O DESCRIPTION continued.

15 RXD I Control serial data RX. TTL/CMOS

compatible levels.

16 TXD O Control serial data TX. TTL/CMOS

compatible levels.

17 PROGRAM I Do not connect. Reserved for production.

18 AUXA I/O Reserved for customer applications.

19 AUXB I/O Reserved for customer applications.

20 GND GND Ground.

Note: Portions of this physical interface specification are in the process of being
redefined. Contact the factory for latest status or for special requirements.

3.3 Electrical

3.3.1 Serial Control Link

Tx Data: TTL / CMOS logic level signal output for data from radio to host
Rx Data: TTL / CMOS logic level signal input for data from host to radio
Handshake: none, handshakes implemented in s/w only

3.4. Serial Data Format

type: asynchronous, full duplex
word format: 1 start, 8 data, 1 parity and 1 stop bit
parity: even
bit rate: 9600 baud

Company Confidential

Standard Communications Corp. -6- November 20, 2000

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

4.0 SERIAL CONTROL PROTOCOL

4.1. Packet Structure

/ control field / data field /
| SOF | byte count | command | data 1 | ... | data n | FCS |

Where: SOF Start Of Frame, hex value 02 (STX)

byte count One byte value indicating the total number of bytes in

the packet, except the SOF.

command One byte value representing the command/message

type being transmitted
data argument or data for the command or message
FCS checksum; the two's complement of the lower 8-bits of

the sum of the binary values of all of the bytes in the

packet except the SOF and FCS.

4.2. Data Transparency

Byte stuffing is used to reduce the probability of errors in frame synchronization. An
STX (02 hex) byte in the control or data fields of the packet, without byte stuffing,
could cause loss of frame synchronization. Byte stuffing applies only to the data and
control fields.
Prior to transmission of a packet, a DLE (10 hex) byte will be inserted prior to every
STX (02 hex) or DLE byte. The stuffed DLE byte is counted as a valid byte in
determining both in the LEN byte count and the FCS.
Once all the byte stuffing has been completed, the LEN byte needs to be compared
against the DLE. For the special case when the LEN byte is equal to a DLE 10h, the
LEN byte is incremented by one and a DLE inserted between the SOF and LEN.
Example of a LEN of 10h:

SOF DLE LEN CMD …. FCS
02h 10h 11h 76h

Note: Do Not DLE the FCS byte.

4.3. Message Flow

step 1 - Command / message transmitted (either direction)
step 2 - Destination processor immediately sends ACK/NAK to acknowledge receipt of

packet. (If required for command received.)

note: If necessary, destination processor initiates response message when requested
command is complete and/or requested data is available.

Company Confidential

Standard Communications Corp. -7- November 20, 2000

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

COMMAND NAME CMD Data Len Radio Mode ACK REQ Page

HTR / RTH

ACK 00 0 ALL NO 9
Initialize Radio Mode 01*(56) 1 ALL YES 9
Set MIN 07 5 TEST YES 10
Set SID 09 2 TEST YES 10
Set Baud / Parity 0B 2 TEST YES 10
Dial 21 16 AMPS YES 11
Answer 22 0 AMPS YES 12
Disconnect 23 0 AMPS YES 12
Key Flash 24 16 AMPS YES 12
System Info Query/Response 25 0/5 ALL YES 13
Reset Radio 41 0 ALL YES 13
Radio power on/Response 45 /0 ALL NO 14
RSSI Query/Response 52 0/1 ALL YES 14
Self Test (CAL) / Response 55 0/1 TEST YES 15
Initialize Radio Mode 56 (01) 1 ALL YES 15
Request Firmware Revision 57 0/2 ALL YES 16
Test mode 58 1 ALL YES 16
Battery Level Query 59 0/1 ALL YES 17
Battery level update 5A /1 ALL YES 17
ID Info Query/Response 73 0/11 TEST YES 18
System A/B Select 74 1 ALL YES 19
Service Status Query 89 0/7 ALL YES 19
Service Unavailable 90 /0 AMPS YES 20
Service Available 91 /0 AMPS YES 21
Ring 92 /0 AMPS YES 21
Call connected 93 /0 AMPS YES 21
Call Failure 94 /0 AMPS YES 22
Call Terminated (remote) 95 /0 AMPS YES 22
Handoff started 96 /0 AMPS YES 22
Handoff completed 97 /0 AMPS YES 22
Call Terminated (signal loss) 98 /0 ALL YES 23
Volume Control 99 1 ALL YES 23
Load Authentication A-key B0 26/1 TEST YES 23
Enable / Disable Authentication B2 1 ALL YES 24
Set Negative SID C8 3 TEST YES 23
Req Negative SID C9 1/3 ALL YES 24
Not supported FE 0 ALL NO 25
NAK FF 0 ALL NO 25

* This command is subject to future removal
Commands Are Not Supported, but will be in future revisions

Data Length

(HTR) Direction Host to Radio
(RTH) Direction Radio to Host

Radio Mode

(AMPS) AMPS Data / AMPS Voice

Company Confidential

Standard Communications Corp. -8- November 20, 2000

Interface Specification Document Rev. -

Cellular Radio Module CRM4250/4200

6.0. DETAILED COMMAND DESCRIPTIONS

6.1. Labeling conventions for syntax:

SOF = "start of frame" flag. Sent as 02 hex.
LEN = length of packet, in bytes.
FCS = "checksum" calculated as described in section 4.1

6.2. General Commands

Commands/messages listed in this section can be used under any operating mode. They
include commands/messages for general flow control, selection and control of
operating mode and general radio control.

00H Command ACK

This message is sent to acknowledge receipt of a command or message. Transmission of
an ACK only indicates successful reception of a supported command, if data or other
response is required, it will be sent in a separate message. An ACK must be received
within 100ms of reception of a packet, otherwise the packet will be assumed lost and a
retry will be attempted. While waiting for reception of an ACK message, any new
messages must be held until the current message has been successfully acknowledged.
After three unsuccessful retry attempts, an error condition should be declared and
appropriate error recovery procedures initiated.

Direction: either
Syntax: | SOF | LEN | 00H | FCS |
ACK required: NO

01H Command Initialize Radio Mode.

This command is used to select the operating mode of the radio. The appropriate
value/bit is set in the data word to identify the selected mode.

Direction: Host to radio
Radio Mode: ALL
Syntax: | SOF | LEN | 01H | aa | FCS |

Where: aa = 01H AMPS voice (MIC Input PIN 8)

aa = 02H Amps Data mode (LINE IN Input PIN 6)

See Command 58H for Entering Test Mode
ACK required: YES

Company Confidential

Standard Communications Corp. -9- November 20, 2000