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Method Of Serial Interface; Rs-232C Interface - LG GLOFA-GM Series User Manual

Programmable logic controller cnet i/f module
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Chapter 4 Performance specification

4.2 Method of serial interface

4.2.1 RS-232C interface

Channel RS-232C uses 9-pin connector (Female) for communication with external devices. The names and
functions of pins and data directions are as shown in the figure below.
[Figure 4.3] Pin specifications of 9-pin connector for RS-232C
Pin No.
Name
1
CD
2
RxD
3
TxD
4
DTR
5
SG
6
DSR
7
RTS
8
CTS
9
RI
Channel RS-232C can communicate with external devices directly and also with remote communication devices
using modem. When connecting modem, communication type of RS-232C must be set to 'modem' with Frame Editor,
and when not using modem, it must be set to null modem. But when the channel mode is as interlocked, modem can
not be connected because it is operated as in null modem even if set to modem.
Remark
[Note1] DTE:Data Terminal Equipment (Cnet I/F module)
[Note2] DCE:Data Communication Equipment (external modem)
Signal direction
Contents
(Cnet<-->external devices)
Carrier Detect
Received Data
Transmitted Data
Data Terminal
Ready
Signal Ground
Data Set Ready
Request To Send
Clear To Send
Ring
Reports carrier detection of DCE to DTE
Received data signal
Transmitted data signal
Reports communication ready of DTE to DCE
Ground line for signal
Reports communication ready of DCE to DTE
Requests data transmission from DTE to DCE
Reports data transmission available from DCE
to DTE
Reports ringing tone received from DCE to DTE
4-6
Description

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