RS-232 Connections/Operation
28
Chapter 7
Document Number 3PCI-0712m
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RS-232 Mode
In RS-232 Mode MIport serial ports function as buffered standard PC serial ports and
operate as DTEs (Data Terminal Equipment). RS-232 interfaces are commonly used for
communications with modems, serial printers, and computer-controlled devices such as
security equipment, bar code scanners and point-of-sale devices.
RS-232 Signal Designations and DB-9 Pinout
RS-232 Mode supports eight single-ended signal lines and signal ground. The DB-9
male connector is configured as a standard RS-232 (DTE) serial port. The table below
shows the signal names and pin numbers.
RS-232 Signal
Name
RS-232 Signal
Description
Direction
(DTE)
DB-9M
Pin
DCD
Data Carrier Detect
Input
1
RD
Receive Data
Input
2
TD
Transmit Data
Output
3
DTR
Data Terminal Ready
Output
4
GND
Signal Ground
------
5
DSR
Data Set Ready
Input
6
RTS
Request to Send
Output
7
CTS
Clear to Send
Input
8
RI
Ring Indicator
Input
9
Figure 12. RS-232 Signal Designations and DB-9 Pinout
Note: Refer to Appendix B for additional cable configurations and
pinouts
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