Motorola GM1200E Installation Manual - Page 20

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Accessory Connector Pin Functions

7.1

GM1200E Databox Radio Connections

NPD Call Request - Logic input to radio from terminal equipment. Activation of line where call

destination is valid NPD address.

Clear to Send - Logic output from radio to terminal equipment indicates that the radio is operational

on an allocated data trafﬁc channel.

Send/Receive - Direction of NPD data, (PTT on for send, PTT off for receive).

Tx Audio - Analogue input modulating signal to radio from terminal equipment. Used to frequency

modulate the radio. Input should be common with external accessory connector (pin 2).

Rx Audio - Analogue output signal from radio to terminal equipment, which is the demodulated

signal of the received RF.

Clear - Logic input to radio from terminal equipment. Activation of line will immediately clear the call.

Note:

Application notes dealing with the functionality of NPD are given in Appendix C of the Basic

Service Manual.

7.2

Radio Power Up/Down

Power to the radio is via the supply line and the radio is normally switched on/off using the On/Off

button, however for a data radio this is not feasible.

The following outlines the GM1200E Databox power up/down logic, and provides recommendations

for installation.

A Non Prescribed Data (NPD) call set up via the radio accessory connector EMERGENCY LINE

(pin 9) will power up the radio, however the radio will remain powered up until the supply line

voltage is removed.

1-14

Table 1-1 Non-Prescribed Data (NPD Pin Functions)

External (Accessory Connector)

Call 1 (NPD Call Request)

Clear To Send (CTS)

Send/Receive

Tx Audio (NPD Data Out)

Rx Audio (NPD Data In)

Clear

Ignition Sense

Ground

Function

Radio Installation