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MELSEC-Q
3 SPECIFICATIONS
3.3 RS-422/485 Interface Specifications
This section describes the RS-422/485 interface specifications.
3.3.1 RS-422/485 terminal block specifications
The following shows the RS-422/485 terminal block specifications for connection to the
target device.
Signal
abbreviation
Signal name
Signal direction
QD51
-R24
External
device
SDA
SDB
RDA
RDB
SG
FG
FG
Send Data (+)
Send Data (-)
Receive Data (+)
Receive Data (-)
Frame Ground
Frame Ground
Signal Ground
SG
SDA
SDB
RDA
RDB
(FG)
(FG)
(1) Each signal is explained below.
1) SDA and SDB signals
Signals for sending data to the target device from the QD51 (-R24).
2) RDA and RDB signals
Signals for the QD51(-R24) to receive data from the target device.
(2) Terminal resistor
Connect terminal resistors in accordance with Section 5.5.2.
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