Motorola MTM700 Detailed Service Manual page 312

A - 2
Pin
4
5
6
7
Table 16 Transceiver Pin Assignment of the 7 pins Expansion Connector (Optional RS232 Interface)
Pin Function
1 SPEAKER -
2 EXT_MIC_AUDIO
3 DIG_IN1 (Ext. PTT)
4 DIG_OUT2 (Ext. Alarm)
5 TX_AUDIO
6 KEYFAIL / Flash
7 ANA_GROUND
8 DIGITAL_GROUND
9 DIG_IN_5 WITH WAKE-
UP (EMERGENCY)
10 DIG_IN_6 WITH
WAKEUP (IGNITION)
11 RX_AUDIO
12 DIG_IN_OUT_1
(AUDIO_PA_ENABLE)
13 SWB +
14 DIG_IN_OUT_2 (HOOK)
15 SCI_DTR
16 SPEAKER +
17 SCI_RTS
18 SCI_CTS
19 SCI_TX
20 SCI_RX
Table 17 Transceiver Pin Assignment of the Rear Accessory Connector
MTM700 Mobile Radio / Detailed Service Manual
Function Description
CTS Clear To Send
SCI – RX Receive Data
SCI – TX Transmit Data
GND Ground
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 radio.
Connecting this pin to the ignition line of the vehicle that will automatically turn
on the radio 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 radio is switched on. The max. current is 1A.
This is a high active digital input. Low = on hook; High = off hook
Reserved for service aid.
Positive output of radio's audio PA (see Pin 1)
Request To Send (Reserved for service aid)
Clear To Send (Reserved for service aid)
Transmit Data (Reserved for service aid)
Receive Data (Reserved for service aid)
CONNECTOR PIN FUNCTIONS
. The DC impedance is
RMS
RMS
RMS