User manual

6 Connector Definitions
6.2 DB25 male RS 232
This connector is only available on the VScom USB-COM 25 model. The pins not mentioned are
a no-connect.
Pin RS232 Pin RS232
2 TxD 7 GND
3 RxD 8 DCD
4 RTS 20 DTR
5 CTS 22 RI
6 DSR
Table 8: DB25 male RS232
Figure 27: DB25 male RS232
6.3 Terminal Block
The Terminal Block connector is designed for connecting RS422 or RS485 signals. However it may
be used for RS232, because the most important signals are available here. This type of connector
is only available on some models.
Clamp 1 2 3 4 5
RS422 Tx− Tx+ Rx+ Rx− GND
RS485 “4w” Tx− Tx+ Rx+ Rx− GND
RS485 “2w” Data− Data+ GND
RS232 DCD RxD TxD DTR GND
Table 9: Terminal Block
June 2009 USB-COM PRO User Manual 31