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D400 Substation Data Manager User's Manual 29
DTE (default)
12345A
B
DCE
12345A
B
Switch SW3/SW4 Configuration
Switches SW3 (for Port 2) and SW4 (for Port 1) control the signals on Pins 4 and 6 of the
RS-232 port. Each switch contains four switch positions that can each be set to ON or
OFF to select the appropriate function for the port option. See illustrations below showing
the switch positions for each setting.
RS-232 Card Switch SW3/SW4 Settings
SW3/SW4 Positions SW3/SW4 Positions
Function
Pin 6
Signal
1 2 3 4
Pin 4
Signal
5 6 7 8
DTE (default)
DSR Input OFF OFF ON OFF
DTR
Output
OFF ON OFF OFF
DCE DTR
Output
OFF ON OFF OFF DSR Input OFF OFF ON OFF
IRIG-B
Enable
Ground OFF OFF OFF ON
IRIG-B
Output
ON OFF OFF OFF