Western Telematic MPC-20VS16-3 - Manual (Page 193)

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Appendix B. Interface Descriptions
B.1. Serial Console Port (RS232)
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 held high.
b) If the port is not set for Modem Mode, DTR output is controlled by the DTR
Output option (Serial Port Parameters Menu, Option 23). Upon disconnect,
Option 23 allows DTR output to be held low, held high, or pulsed for 0.5
seconds and then held high.
6
7
8
9 X
X
1
2
3
4
5 Carrier Detect
Data In
Data Out
Ready Out
Request to Send
Clear to Send
DCD
RXD
TXD
DTR
GND
RTS
CTS
RS232
Port
DB9
Figure B.1: RS232 Console Port Interface