Advantech ARK-5261 User Manual page 20

2.3.1.1 COM connector
ARK-5261 provides four D-sub 9-pin connectors, which offers RS-232/422/485 serial
communication interface ports. Default setting is RS-232, if you want to use RS-422/
485, you can change the mode in BIOS setting. You can find detailed setting meth-
ods in Chapter 3.
Table 2.2: COM Connector Pin Assignments
RS-232
Pin Signal Name
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI
Note! NC represents "No Connection".
ARK-5261 User Manual
RS-422
Signal Name
Tx-
Tx+
Rx+
Rx-
GND
NC
NC
NC
NC
12
RS-485
Signal Name
DATA-
DATA+
NC
NC
GND
NC
NC
NC
NC