Aplex Technology APC-3519 - Manual (Page 26)

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20. COM1:
(Type DB9), Rear serial port, standard DB9 Male serial port is provided to make a direct
connection to serial devices.
RS232 (Default):
Pin# Signal Name
1 DCD# (Data Carrier Detect)
2 RXD (Received Data)
3 TXD (Transmit Data)
4 DTR (Data Terminal Ready)
5 Ground
6 DSR (Data Set Ready)
7 RTS (Request To Send)
8 CTS (Clear To Send)
9 JP1 select Setting (RI/5V/12V)
RS422 (option):
Pin# Signal Name
1 422_R+
2 422_R-
3 422_T-
4 422_T+
5 Ground
6 NC
7 NC
8 NC
9 NC
RS485 (option):
Pin# Signal Name
1 NC
2 NC
3 485-
4 485+
5 Ground
6 NC
7 NC
8 NC
9 NC