Mitsubishi Electric QJ71MB91 User Manual page 155

6
PRE-OPERATIONAL PROCEDURES AND SETTINGS
Third party
master
SD
RD
SG
Figure 6.18 Connection (for link operation setting, 1:n communication, 4 wires) when host is slave
Figure 6.19 Connection (for link operation setting, 1:n communication, 2 wires) when host is slave
2) When performing 1:n communication with a third party master station (RS-232
interface)
(Link operation setting)
< For 4-wire communications >
QJ71MB91
RS-232
SD
RD
SG
Output for cable
disconnection
detection
Input for cable
disconnection
detection
Link operation
setting
SDA
Terminating
R
resistor
SDB
RDA
Terminating
R
RDB
resistor
SG
FG
< For 2-wire communications >
Third party
master
RS-232
SD
RD
SG
Link operation
setting
Terminating
R
resistor
6.5.2 How to connect the RS-422/485 interface
Third party
slave
SDA
SDB
RDA
RDB
SG
FG
QJ71MB91
QJ71MB91
SD
RD
SG
Output for cable
disconnection
detection
Input for cable
disconnection
detection
Third party
slave
SDA SDA
SDB SDB
RDA RDA
RDB RDB
SG SG
FG FG
6.5 Connection to a Target Device
QJ71MB91
SDA Terminating
R
resistor
SDB
RDA
Terminating
R
RDB
resistor
SG
FG
QJ71MB91
SDA
SDB
RDA
R
RDB
SG
FG
6
- 18
1
2
3
4
5
6
7
8