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2-5-9 RS-232C Port
RS-232C Connections The RS-232C port on the CQM1-CPU21-E/4j-EV1 can be connected to vari-
ous devices for communications with the PC via PORT INPUT and PORT OUT-
PUT instructions or for automatic data links with other CQM1 PCs (also
CQM1-CPU21-E/4j-EV1), as shown in the following diagram.
Personal computer
PT
Bar Code Reader
Printer CQM1-CPU21-E/4j-EV1
RS-232C
Host link
1 to 1 link
RS-232C Specifications The specifications for the RS-232C port are given below. Devices that meet
these specifications can be connected.
Connector Pin Assignments
Pin assignments for the RS-232C port are given in the following table.
Pin Abbreviation Name Direction
1 FG Field ground ---
2 SD (TXD) Send data Output
3 RD (RXD) Receive data Input
4 RS (RTS) Request to send Output
5 CS (CTS) Clear to send Input
6 --- Not used. ---
7 --- Not used. ---
8 --- Not used. ---
9 SG Signal ground ---
Connector fitting FG Field ground ---
Wiring and Connections
Section 2-5
5
1
9
6
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