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COM2 RS-232 serial port connector (10-pins pin-header): COM2
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
y Figure:
COM3 RS-232/422/485 serial port connector (14-pins pin-header):
JCN1
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 COM3 Figure:
2
19
10
13
14
1
2