Western Telematic MPC-20VS20-1 Appendix B. Interface Descriptions, B.1. Serial Console Port RS232

Appendix B. Interface Descriptions

DB9

RS232

Port

DCD	1	Carrier Detect
RXD	2	Data In
TXD	3	Data Out
DTR	4	Ready Out
GND	5
	6	X
RTS	7	Request to Send
CTS	8	Clear to Send
	9	X

Figure B.1: RS232 Console Port Interface

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.

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