Mitsubishi Electric GOT2000 Series Connection Manual page 296

(8) RS-422/485 connection diagram 8)
GOT side(slave)
*3
(2nd)
SDA
SDB
RDA
RDB
SG
*1
*2
*3
*4
(9) RS-422/485 connection diagram 9)
GOT side(slave)
*3
(2nd)
SDA
SDB
RDA
RDB
SG
*1
*2
*3
*4
7 - 10
7.3 Connection Diagram
Some MODBUS/RTU master equipment doesn't have SG. In this case, the wiring between GOT and SG is unnecessary.
Some MODBUS/RTU master equipment require the control line (CS, RS, etc.) to be controlled.
Make sure to connect the cables and wires as described in the MODBUS/RTU master equipment manual.
When placing the GOT to the terminal in the system configuration, set the terminating resistor to "330 Ω".
When placing the GOT to the position other than the terminal, set the terminating resistor of the GOT to "OPEN".
➠
1.4.3 Terminating resistors of GOT
Set the 1pair/2pair signal selection switch to "2pair" when using the connection conversion adapter.
➠
Connection Conversion Adapter User's manual
For the terminating resistor of MODBUS/RTU master equipment, refer to the manual of MODBUS/RTU master equipment.
The actual terminal layout on the MODBUS/RTU master equipment may differ from the example shown above. SDA/B(+/-) and
RDA/B(+/-) terminals can be separated from each other. Make sure to connect the cables and wires as described in the
MODBUS/RTU master equipment manual.
Some MODBUS/RTU master equipment doesn't have SG. In this case, the wiring between GOT and SG is unnecessary.
When placing the GOT to the terminal in the system configuration, set the terminating resistor to "110 Ω".
When placing the GOT to the position other than the terminal, set the terminating resistor of the GOT to "OPEN".
➠
1.4.3 Terminating resistors of GOT
Set the 1pair/2pair signal selection switch to "1pair" when using the connection conversion adapter.
➠
Connection Conversion Adapter User's manual
For the terminating resistor of MODBUS/RTU master equipment, refer to the manual of MODBUS/RTU master equipment.
GOT side(slave)
*3
(1st)
SDA
SDB
RDA
RDB
SG
GOT side(slave)
*3
(1st)
SDA
SDB
RDA
RDB
SG
MODBUS /RTU master equipment side
RDA(+)
RDB(-)
SDA(+)
SDB(-)
SG
MODBUS /RTU master equipment side
(+)
(-)
SG
*1*2*4
*1*2*4