Motorola MTM800 User Manual page 216

A - 2
Pin Function
1 EXTERNAL SPEAKER -
2 EXTERNAL MIC AUDIO
3 EXTERNAL PTT
4 EXTERNAL ALARM
5 TX_AUDIO
6 KEYFAIL / FLASH
7 ANALOG GROUND
8 DIGITAL_GROUND
9 EMERGENCY
10 IGNITION
11 RX_AUDIO
12 AUDIO_PA_ENABLE
13 SWB +
14 HOOK
15 SCI_DTR
16 SPEAKER +
17 * SCI_CTS
18 * SCI_RTS
19 * SCI_RXD
20 * SCI_TXD
Table A-1 Transceiver Pin Assignment of the Rear Accessory Connector
NOTE *
Description
Speaker – and Speaker + (Pin 16) are used to connect an external speaker. The
audio PA is a bridge amplifier with a minimum load resistance of 3.2 ohms.
External-, Emergency-, or Hot-Microphone; depends on CPS programming.
This microphone signal is independent of the microphone signal on the micro-
phone connector. The nominal input level is 80mV
660Ohms. The AC impedance is 560Ohms.
This is a digital input to trigger external PTT; active low; non active high
This is a digital output for External Alarm / Fault Indication; active low; open col-
lector with 4k7 Ohms pull up to B+;
This input is intended for injecting signals into the transmit path. Input imped-
ance > 10 k Ohms; input level = 775mV
This line supports the encryption module.
Ground
Ground
To activate this functionality the pin has to be connected to ground. This will turn
on the terminal, Low active.
Connecting this pin to the ignition line of the vehicle that will automatically turn
on the terminal if the ignition of the vehicle is turned on, High active.
This is the received RX signal. Output impedance approximate 600 Ohms
unsymmetrical, output level = 775mV
This is a digital input. High level or pin open enables the audio PA; Low level dis-
ables the audio PA.
This voltage is available when the terminal is switched on.
The max. current is 1.0A w/o GPS board and 0.8A with GPS board mounted.
This is a high active digital input. Low = on hook; High = off hook
Reserved for service aid.
Positive output of terminal's audio PA (see Pin 1)
Terminal OUTPUT: Clear To Send (reserved for service aids)
Terminal INPUT: Request To Send (reserved for service aids)
Terminal OUTPUT: Receive Data (reserved for service aids)
Terminal INPUT: Transmit Data (reserved for service aids)
The 4-wire 3 Volts SCI interface on the accessory connector (pins 17 -20) can only be
used for flashing of terminal firmware and programming software features.
It can NOT be used for communication during normal terminal operation.
CONNECTOR PIN FUNCTIONS
. The DC impedance is
RMS
RMS
RMS