Mitsubishi QJ71MB91 - 3.3 RS-422;485 Interface Specification

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3.3 RS-422/485 Interface Specification
3.3.1 RS-422/485 terminal block specification
3
SPECIFICATIONS
3.3 RS-422/485 Interface Specification
This section explains RS-422/485 interface specifications.
3.3.1 RS-422/485 terminal block specification
This section provides the specifications of RS-422/485 terminal block that is connected to
a target device.
(1) The following explains control signals.
(a) SDA, SDB signal
Signal for QJ71MB91 to send data to a target device
(b) RDA, RDB signal
Signal for QJ71MB91 to receive data from a target device
(2) Terminating resistor
Connect the terminating resistor according to Section 6.5.2.
Signal
code
Signal name
Signal direction
QJ71MB91 Target device
SDA Transmission data (+)
SDB Transmission data (-)
RDA Reception data (+)
RDB Reception data (-)
SG Signal ground
FG Frame ground
FG Frame ground
Figure 3.2 RS-422/485 terminal block specifications
SG
SDA
SDB
+
+
+
+
+
+
RD
A
RDB
+
(FG)
(FG)