NEXCOM OPPC 1520T - Manual (Page 37)

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Chapter 2: Jumpers and Connectors
OPPC 1520T/1720T User Manual
Pin Definition Pin Definition
1 TXD-: Transmit Data Negative
RXD-: Receive Data Negative 2 TXD+: Transmit Data Positive
RXD+: Receive Data Positive
3 Reserved 4 Reserved
5 Reserved 6 Reserved
7 Reserved 8 Reserved
9 Reserved (could be a 5V or 12V
power pin)
RS485
6
1 5
9
COM2 Port (Isolation with RS422/485)
Connector type: DB-9
Connector location: COM2
Pin Definition Pin Definition
1 DCD#: Data Carrier Detect 2 RXD#: Receive Data
3 TXD: Transmit Data 4 DTR#: Data Terminal Ready
5 GND 6 DSR#: Data Set Ready
7 RTS#: Request To Send 8 CTS#: Clear To Send
9 RI#: Ring Indicator (could be a 5V
or 12V power pin)
RS232
Pin Definition Pin Definition
1 TXD-: Transmit Data Negative 2 TXD+: Transmit Data Positive
3 RXD+: Receive Data Positive 4 RXD-: Receive Data Negative
5 GND DCD#: Data Carrier Detect 6 RTS-: Request To Send Negative
7 RTS+: Request To Send Positive 8 CTS+: Clear to Send Positive
9 CTS-: Clear To Send Negative
(could be a 5V or 12V power pin)
RS422