Rs-422/485 Interface Specification; Rs-422/485 Terminal Block Specification - Mitsubishi QJ71MB91 User Manual

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.
(FG)
(FG)
(1) The following explains control signals.
(2) Terminating resistor
3
- 6 3.3 RS-422/485 Interface Specification
3.3.1 RS-422/485 terminal block specification
Signal
code
SDA
SDA
+
SDB
+
SG
SDB
+
RDA
+
RDA
+
RDB
+
RDB
+
SG
FG
FG
Figure 3.2 RS-422/485 terminal block specifications
(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
Connect the terminating resistor according to Section 6.5.2.
Signal name
Transmission data (+)
Transmission data (-)
Reception data (+)
Reception data (-)
Signal ground
Frame ground
Frame ground
Signal direction
QJ71MB91 Target device