protech PS3100 Series - Page 24

Chapter 2 Hardware Configuration
PS3100 SERIES USER’S MANUAL
Page: 2-7
COM4 : COM4 Connector
The pin assignments are as follows :
PIN ASSIGNMENT
1 DCD4
2 RXD4
3 TXD4
4 DTR4
5 GND
6 DSR4
7 RTS4
8 CTS4
9
RI
10 NC
COM1-1 : COM1-1 Connector
The pin assignments are as follows :
PIN ASSIGNMENT
1 DCD1
2 RXD1
3 TXD1
4 DTR1
5 GND
6 DSR1
7 RTS1
8 CTS1
9
RI/+5V/+12 selectable
10 NC
 COM1 and COM1_1 can't be used simultaneously.