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Figure A-2 shows a way of wiring an EIA-232-D connector to enable a computer to
connect to a basic terminal with only three lines. This is feasible because most
terminals have a DTR signal that is ON, and which can be used to pull up the CTS,
DCD and DSR signals. Two of these connectors wired back-to-back can be used. In
this implementation, however, diagnostic messages that might otherwise be generated
do not occur because all the handshaking is bypassed. In addition, the TX and RX lines
may have to be crossed since TX from a terminal is outgoing but the TX line on a
modem is an incoming signal.
Figure A-2. Minimum EIA-232-D Connection
MVME167/D3
EIA-232-D CONNECTOR
GND
1
TxD
2
RxD
3
RTS
4
CTS
5
DSR
6
GND
7
DCD
8
DTR
20
Levels of Implementation
A-5
A
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