Unclassified
General Description
1-7
Table 1-1. 25 Pin Accessories Connector, Pin Functions
Pin Designation Description
1 SPKR-
Differential output to the external 8, 8W speaker
2 EXT RX1 OUT-
Differential receive output (– line) of main sideband (0 dBm, 600; not
affected by the volume control, nor by the squelch)
3 SPKR+
Differential output to the external 8, 8W speaker
4 EXT RX1
AUDIO+
Differential receive audio output (0 dBm, 600; not controlled by
volume, but affected by squelch)
5 EXT RX1
AUDIO-
6 EXT TX1 IN+
Differential transmit input (600 input impedance; 0 dBm is required for
full power)
7 EXT TX1 IN-
8 PTT IN VOICE Transmission command (short to ground) for voice signals (Note 1)
9 PTT IN DATA Transmission command (short to ground) for data signals (Note 1)
10 PTT IN CW Transmission command (short to ground) for CW (Morse) signals
11 SW A+ Primary DC voltage current limited output (max 1A)
12 DSI/KW C C BDM – Data serial in/external RF amplifier channel change
13 KW ON/OFF External RF amplifier power on/off output
14 EXT RX1 OUT+
Differential receive output (+ line) of main sideband (0 dBm, 600; not
affected by the volume control, nor by the squelch)
15 RXA Receive input (point-to-point protocol to host/HLC)
16 TXA Transmit output (point-to-point protocol to host/HLC)
17 EX RESET External RESET input (for BDM)
18 GND Ground
19 KW PTT PTT output to external RF amplifier
20 EXT ALARM External alarm output (open collector, pulled to ground when external
alarm is activated)
21 VPP Flash programming voltage, input to BDM
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