A. RS232 Port Interface
DCD and DTR hardware lines function as follows:
1. When connected:
a) If either port is set for Modem Mode, the DTR output at
either port reflects the DCD input at the other end.
b) If neither port is set for Modem Mode, DTR output is
held high (active).
2. When not connected:
a) If the port is set for Modem Mode, upon disconnect
DTR output is pulsed for 0.5 seconds and then
b) If the port is not set for Modem Mode, DTR output is
controlled by the DTR Output option (Parameters
Menu, Option 74). Upon disconnect, Option 74 allows
DTR output to be held low, held high, or pulsed for 0.5
seconds and then held high.
Figure A.1: RS232 Port Interface