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Chapter 4 Performance specification
4-6
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 Contents
Signal direction
(Cnet<-->external devices)
Description
1 CD Carrier Detect Reports carrier detection of DCE to DTE
2 RxD Received Data Received data signal
3 TxD Transmitted Data Transmitted data signal
4 DTR
Data Terminal
Ready
Reports communication ready of DTE to DCE
5 SG Signal Ground Ground line for signal
6 DSR Data Set Ready Reports communication ready of DCE to DTE
7 RTS Request To Send Requests data transmission from DTE to DCE
8 CTS Clear To Send
Reports data transmission available from DCE
to DTE
9 RI Ring Reports ringing tone received from DCE to DTE
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)