USB-COM+ Hardware Settings and Pinouts

Inside the unit, there is a 1 × 3 (3 pin) header block which is used to set pin 9 of the DB9 male connector. You need to push down the upper case and slide it open by following the direction of the arrow in the illustration below. You can set the jumper to change pin 9 to providing an RI signal or DC +5V 150mA power.

 

 

RS-232 DB9 Male Connector Pinouts

 

 

Pin header 1 & 2 short

 

 

PIN SIGNAL
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 RI

 

Pin header 2 & 3 short

 

 

PIN SIGNAL
1 DCD
2 RxD
3 TxD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 DC+5V