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MELSEC-
A
4 PROCEDURES AND SETTINGS BEFORE OPERATION
(3) Precautions for connections
(a) R2 does not use the CD signal as a control signal in sending/receiving data
to/from an external device.
(b) Handle the connection cable's FG signal and shield as described below.
Connection method Remarks
FG signal Connect to the body of the
R2 connector.
Shield Connect to the body of the
R2 connector.
(Do not connect with the
external device.)
Do not short circuit the FG signal and
SG signal of the connection cable.
When the FG signal and SG signal are
connected internally on the external
device side, do not connect the R2 side
FG signal with the external device.
(c) If the data cannot be communicated due to noise from the external device,
even when the above wiring and connection are used, wire and connect as
shown below.
1) Connect across the FG of each station with the connection cable's
shield.
For an external device, connect as explained in the instruction manual
for the external device.
2) Connect the signals other than the connection cable's SG and FG as a
pair with SG.
SD RD
RD SD
DSR DTR
DS
R
DTR
SG SG
(R2 side)
FG
.....
.....
.....
Shield (Partner device side)
Connector body section
* The R2 FG is connected with the screw fixing section of the connector, and
is the FG for the module body.
(d) Do not connect the RS-232-C interface with an RS-422 device.
If connected with an RS-422 device, the hardware of the connected
devices's RS-422 interface could be damaged and communication
inhibited.