Com1/3/4 Rs-232 Serial Port Connector(Cn13/Cn21/Cn22); Com2 Rs-232/422/485 Serial Port Connector (Cn14) - Aaeon SBC-657B Manual

Half-Size CPU Ca r d

2.25 COM1/3/4 RS-232 Serial Port Connector(CN13/CN21/CN22)

Pin Signal
1 DCD
3 TXD
5 GND
7 RTS
9 RI

2.26 COM2 RS-232/422/485 Serial Port Connector (CN14)

Different devices implement the RS-232/422/485 standard in
different ways. If you have problems with a serial device, be sure to
check the pin assignments below for the connector.
Pin Signa l
DCD
1
(422TXD-/485DATA-)
TXD(422TXD+/485DATA
3
+)
5 GND
7 RTS
9 RI/+12V
Chapter 2 Quick Installation Guide
S B C - 6 5 7 B / H S B - 6 5 7 I
Pin Signal
2 RXD
4 DTR
6 DSR
8 CTS
10 N.C
Pin Signal
2 RXD(422RXD+)
4 DTR(422RXD-)
6 DSR
8 CTS
10 N.C
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