Mitsubishi Electric QJ71MB91 User Manual page 153

6
PRE-OPERATIONAL PROCEDURES AND SETTINGS
(2) Connection examples
(a) Connection for 1:1 communication
(b) Connection for 1:n communication when host is master
QJ71MB91 (CH2)
Master or Slave
Signal name
SDA
SDB
RDA
Terminating
R
resistor
RDB
SG
FG
Figure 6.13 Connection for 1:1 communication
1) For 4-wire communications
QJ71MB91
SDA
Terminating
R
resistor SDB
RDA
Terminating
R
resistor
RDB
SG
FG
Figure 6.14 Connection (for 1:n communication, 4 wire) when host is master
2) For 2-wire communications
QJ71MB91
SDA
SDB
RDA
Terminating
R
resistor
RDB
SG
FG
Figure 6.15 Connection (for 1:n communication, 2 wires) when host is master
Third party
slave
SDA
SDB
RDA
RDB
SG
FG
Third party
slave
SDA
SDB
RDA
RDB
SG
FG
6.5 Connection to a Target Device
6.5.2 How to connect the RS-422/485 interface
Target device
Slave or
Master
Signal name
RDA
Terminating
R
resistor
RDB
SDA
SDB
SG
FG
Third party
slave
SDA
Terminating
R
SDB resistor
RDA
Terminating
R
RDB resistor
SG
FG
Third party
slave
SDA
SDB
RDA
R
RDB
SG
FG
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