User guide

44 Board Interfaces
COM2 Mode Selection Switches on RTM (SW1~SW4)
These switches on the RTM select COM2 to be RS-232 full
modem, RS-422, RS-485, or RS-485+ half-duplex mode.
RS-232 full modem is set by default. See “cPCI-R3610(T) RTM
Board Layout” on page 29 for switch locations.
Table 4-17: COM2 Mode Selection Switch Settings
Mode Pin SW1 SW2 SW3 SW4
RS-232
1 OFF ON ON ON
2 OFF OFF OFF OFF
3 OFF ON ON OFF
4 OFF OFF OFF OFF
RS-422
1ONOFFOFFOFF
2 OFF ON ON ON
3ONOFFOFFOFF
4 OFF ON ON OFF
RS-485
1ONOFFOFFOFF
2 OFF ON ON OFF
3ONOFFOFFON
4 OFF ON ON OFF
RS-485+
1 OFF OFF OFF OFF
2ONONONOFF
3 OFF OFF OFF ON
4ONONONOFF
SW1 SW2 SW3 SW4