ADLINK cPCI-6965 - Manual (Page 60)

46 Board Interfaces
COM2 Mode Selection Switches (SW5~SW8)
This is switch is to select COM2 to be RS-232 full modem or
RS-422, RS-485, RS-485+ half Duplex mode. RS-232 full
modem is set by default.
Table 4-19: COM2 Mode Switch Settings
Location SW5 SW6 SW7 SW8
RS-232
Full Modem
1 OFF ON ON ON
2 OFF OFF OFF OFF
3 OFF ON OFF ON
4 OFF OFF OFF OFF
RS-422
Half Duplex
1 ON OFF OFF OFF
2 ON ON ON ON
3 OFF OFF OFF OFF
4 OFF ON OFF ON
RS-485
Half Duplex
1 ON OFF OFF OFF
2 ON ON OFF ON
3 OFF OFF ON OFF
4 OFF ON OFF ON
RS-485+
Half Duplex
1 OFF OFF OFF OFF
2 OFF ON OFF ON
3 ON OFF OFF OFF
4 ON ON ON ON