MP Baseplate Connectors
203
Appendix A
Pin-Outs for Cables and Connectors
RS-232 Pin-Outs
RS-232 Signal Descriptions
Spacing (on or 0) occurs when RS-232 signals are b6 and +12 V DC;
marking (off or 1) occurs when they are between –6 and –12 V DC. The maximum
cable length is 15 meters (50 feet), but can be extended using modems. The
following table describes the RS-232 signals.
DB-9 Pin
Signal
Direction
RS-232 Function
1
CD
In
Carrier detect
2RXD
In
Receive data
3
TXD
Out
Transmit data
4
DTR
Out
Data terminal ready
5
GND
—
Signal ground
6
DSR
—
Not used (data set ready)
7
RTS
Out
Request to send
8
CTS
In
Clear to send
9
RI
—
Not used (ring indicator)
Housing
Shield
—
Safety ground
Signal
Designator
Description
Clear to Send
CTS
MP ignores CTS and transmits data as soon as
it is available
Request to Send
RTS
MP turns on RTS unconditionally
Data Carrier Detect
DCD
MP ignores DCD and always accepts data
from RXD
Transmit Data
TXD
MP transmits serial data
Receive Data
RXD
MP receives serial data
7
8
9
2
3
4
5
1
6
Shield
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