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COM4 RS-232/422/485 serial port connector (14-pins pin-header):
JCN2
Pin # Assignment Pin # Assignment
1 DCD (Data Carrier Detect) 2 DSR (Data Set Ready)
3 RXD (Receive Data) 4 RTS (Request to Send)
5 TXD (Transmit Data) 6 CTS (Clear to Send)
7 DTR (Data Terminal Ready) 8 RI (Ring Indicator)
9 Ground 10 Ground
11 TXD+ (Transmit Data+) 12 TXD- (Transmit Data-)
13 RXD+ (Receive Data+) 14 RXD- (Receive Data-)
y COM4 Figure:
Note: How to connect RS485 device with COM port ribbon cable?
Our Industrial Board encloses a COM port ribbon cable for internal
connection. RS422/485 device must connect to downside D-Sub
with 5-pins cable and signal indication as below.
13
14
1
2
5
9
1
6
RS-422/485:
1: TXD-
2: TXD+
3: RXD-
4: RXD+
5: GND
For RS-422/485 connector
For RS-232 connector