External Wiring With Rs-232 Interface; Connector Specifications - Mitsubishi Melsec-L Series User Manual

6.2 External Wiring with RS-232 Interface

This section explains the specifications of RS-232 and how to connect with external
devices.
6.2.1 RS-232 connector specifications
The following shows the specifications of the RS-232 connector that connects the C24
to an external device.
(1) The control signals are described below. (The pin numbers of the connector are
• The C24 performs send and receive
Full-duplex
communication • If the CD(DCD) signal is turned off during
Half-duplex
User's Manual (Application)
communication
6 - 2
enclosed in parentheses.)
1) CD(DCD) signal (1)
• The C24 operates according to the setting of the CD terminal check.
CD terminal check enabled
processing when the CD(DCD) signal
(receive carrier detection) is ON.
data communication, the C24 initializes the
transmission sequence.
The CD terminal check can be set in GX Works2 as follows.
"Various_Control_Specification" screen
control" "CD terminal check designation (for RS-232)"
2) RD(RXD) signal (2)
This is a signal to receive data.
3) SD(TXD) signal (3)
This is a signal to send data.
6 SETTING AND WIRING
CD terminal check disabled
• The C24 performs send and receive
processing regardless of the ON/OFF status
of the CD(DCD) signal.
• Data communications is possible with an
external device that cannot turn the
CD(DCD) signal ON/OFF.
Setting impossible.
"For designation of communication
6
6 - 2