QTERM-IV/P40 User's Manual
39
Beijer Electronics Fax 801-466-8792 Web www.beijerelectronicsinc.com Phone 801-466-8770
Table 1-5. Pin Assignments for PC-Style COM Ports.
COM Ports with DB25 Male Connectors
COM Ports with DB9 Male Connectors
Pin
Function
Pin
Function
2
PC transmit
1
CD *
3
PC receive
2
PC receive
5
CTS *
3
PC transmit
6
DSR *
5
ground
7
ground
6
DSR *
8
CD *
8
CTS *
22
RI *
9
RI *
*These lines normally can be left unconnected. Some PCs may require that one or more of them be pulled to 5 volts
through a pullup resistor (about 300 W)