Micro-Comm S4500 - Communication Port Pinouts

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COM1 (25 pin Male RS-232 and Radio)
1 - GND
2 - TXD
3 - RXD
4 - RTS
5 - CTS
6 - DSR
7 - GND
8 - DCD
9 - 12VDC (4A)
10 - 12VDC (4A)
12 - Gain Set A
13 - Gain Set B
14 - TXA
16 - RXA
18 - PTT
19 - /PTT
20 - DTR (12VDC) Note: The M555 and M655 use the RS-232 driver output for this pin (not 12VDC).
21 - DO1 (open collector outputs - not available on the S4500)
22 - DO2
23 - DO3
24 - DO4
25 - GND
Other COM Ports (9 pin Male RS-232)
2 - RXD
3 - TXD
4 - DTR
5 - GND
7 - RTS
8 - CTS
Other COM Ports (9 pin Male using RS-485 Mode)
2 - RX(-)
3 - TX(-)
5 - GND
7 - TX(+)
8 - RX(+)
Communication Port Pinouts