Technologic Systems, Inc.
TS-ENC550 - 10
Pin 1 highlighted
COM3:
COM3 is brought in from the enclosed SBC. This 9-pin SubD connector is
industry standard for a PC. The TxD, RxD, RTS, CTS, and ground pins are supported for
RS-232 communications.
See the table below for RS-485 operation.
COM3 9-Pin SubD Outs Table
Half Duplex RS-485
RS-232
Full Duplex RS-485
9-Pin
SubD
Signal
9-Pin
SubD
Signal
9-Pin
SubD
Signal
1
1
RX/TX +
1
1
1
1
TX +
2
2
2
2
Receive data
2
2
3
3
3
3
Transmit data
3
3
4
4
4
4
4
4
RX +
5
5
Ground
5
5
Ground
5
5
Ground
6
6
RX/TX -
6
6
6
6
TX -
7
7
7
7
Request to Send
7
7
8
8
8
8
Clear to Send
8
8
9
9
9
9
9
9
RX -
