Technical Manual

GUARDIAN VHF 110W MOBILE 10-1
CHAPTER 10: CONNECTOR PINOUTS
10.1 Accessory Connector Pins and Functions
Pin Signal Name Description
1 RS232_RXD Receive data line output (DCE), RS232 level
(>+3V=ZERO, <-3V=ONE)
2 RS232_RTS Data port control input (DCE), RS232 level (>+3V=ON, <-3V=OFF)
3 SERIAL_CLOCK Synchronous clock output to PC terminal (DCE), RS232 level
(>+3V=ZERO, <-3V=ONE)
4 RS232_CTS Data port control output (DCE), RS232 level (>+3V=ON, <-3V=OFF)
5 PC_232RXD Programming receive data line output (DCE), RS232 level
(>+3V=ZERO, <-3V=ONE)
6 SQUELCH_INF Squelch, low on valid receive signal, 7.8V squelched
7 GND Ground
8 EXTERNAL_SPEAKER_N Balanced audio output from RECM, 500 mW into 8 ohms
9 EXTERNAL_PTT/KID PTT input asserted by voltage closure to ground or pseudo-random key
insert data, LVTTL level input
10 7.7V Test point for internal regulated voltage supply
11 EXTERNAL_MIC/WE Microphone input or key transfer indicator input, asserted by voltage
0.8 Vdc
12 GND Ground
13 INTERNAL_SPEAKER_P Balanced audio input from external device; can override RECM audio
output signal
14 PTT_SWITCH PTT input asserted by voltage closure to ground
15 RS232_DTR Data port control input (DCE), RS232 level (>+3V=ON, <-3V=OFF)
16 PC_232TXD Programming transmit data line input (DCE), RS232 level
(>+3V=ZERO, <-3V=ONE)
17 RS232_TXD Transmit data line input (DCE), RS232 level
(>+3V=ZERO, <-3V=ONE)
18 WRU_MONITOR Voltage input identifies external device
19 EXT_10W_SPEAKER_N Balanced audio output for external 10W 4-ohm speaker
20 EXT_10W_SPEAKER_P Balanced audio output for external 10W 4-ohm speaker
21 EXTERNAL_MIC_BIAS/KEY Microphone bias or bi-directional key data, LVTTL levels
22 EXTERNAL_SPEAKER_P/KLD Balanced audio output from RECM, 500 mW into 8 ohms or LVTTL
low-output level when keyloader is connected
23 EMERGENCY_SWITCH Active low control to transmit emergency signal
24 IGN_SW Power switch override input. Ground forces off, open enables switch
25 INTERNAL_SPEAKER_N Balanced audio input from external device; can override RECM audio
output signal