Connector Pin Assignments; Rs-232 (Male Db9); Rs-422/485 (Male Db9) - Omega Engineering OMG-COMM2-EX User Manual

Connector Pin Assignments

RS-232 (Male DB9)

Name
TD Transmit Data
RTS Request To Send
DTR Data Term Ready
GND Ground
RD Receive Data
DCD Data Carrier Detect
DSR Data Set Ready
CTS Clear To Send
RI Ring Indicator
Note: These assignments meet EIA/TIA/ANSI-574 DTE for DB-9 type
connectors.

RS-422/485 (Male DB9)

Signal
GND Ground
TX + Transmit Data Positive
TX- Transmit Data Negative
RTS+ Request To Send Positive
RTS- Request To Send Negative
RX+ Receive Data Positive
RX- Receive Data Negative
CTS+ Clear To Send Positive
CTS- Clear To Send Negative
Technical Note: Please terminate any control signals that are not going to be
used. The most common way to do this is connect RTS to CTS and RI. Also,
connect DCD to DTR and DSR. Terminating these pins, if not used, will help
insure you get
OMG-COMM2-EX
Pin #
3
7
4
5
2
1
6
8
9
Name
the best performance
Technical Description
Mode
Output
Output
Output
Input
Input
Input
Input
Input
Pin # Mode
5
4 Output
3 Output
6 Output
7 Output
1 Input
2 Input
9 Input
8 Input
from your adapter.
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