Rs-422/485 Interface Specifications; Rs-422/485 Terminal Block Specifications - Mitsubishi QD51-R24 User Manual

3 SPECIFICATIONS

3.3 RS-422/485 Interface Specifications

3.3.1 RS-422/485 terminal block specifications

(FG)
(FG)
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This section describes the RS-422/485 interface specifications.
The following shows the RS-422/485 terminal block specifications for connection to the
target device.
SDA
SG
SDB
RDA
RDB
(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.
Signal
Signal name
abbreviation
SDA Send Data (+)
SDB
Send Data (-)
RDA Receive Data (+)
RDB Receive Data (-)
SG
Signal Ground
FG
Frame Ground
FG
Frame Ground
MELSEC-Q
Signal direction
External
QD51
device
-R24
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