Com2 Rs232 Connector; Com3 Rs232/Rs422/Rs485 Connector - Nexcom nROK 7251 Series User Manual

Railway computer
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Chapter 2: External Connectors Pinout Description

COM2 RS232 Connector

Connector number: 14
1
5
1
5
6
9
6
9
Pin
Definition
1
DCD
3
TXD
5
ISO_GND
7
RTS
9
RI
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Pin
Definition
2
RXD
4
DTR
6
DSR
8
CTS

COM3 RS232/RS422/RS485 Connector

Connector number: 15
1
5
1
5
6
9
6
9
Pin
Definition
RS232 DCD#/RS422 TX- /
1
RS485_DATA-
3
RS232 TX/RS422_RX+
5
GND
7
RTS#
9
RI
17
Pin
Definition
RS232 RX/RS422_TX+ /
2
RS485_DATA+
4
RS232 DTR#/RS422_RX-
6
DSR#
8
CTS#
nROK 7251 Series User Manual

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