System Configuration - Mitsubishi Electric GOT2000 Series Connection Manual

(4) RS-422/485 connection diagram 3)
GOT side (terminal block)
SDA1 1
SDB1 2
RDA1 3
RDB1 4
SDA2 5
SDB2 6
RDA2 7
RDB2 8
SG 9
FG 10
*1 The actual terminal layout on the MODBUS
B(+/-) terminals can be separated from each other. Make sure to connect the cables and wires as described in the MODBUS
RTU equipment manual.
*2 Some MODBUS
*3 When placing the GOT to the terminal in the system configuration, set the terminating resistor to "100 OHM".
When placing the GOT to the position other than the terminal, set the terminating resistor of the GOT to "No".
*4 For the terminating resistor of MODBUS

Precautions when preparing a cable
(1) Cable length
The length of the RS-422/485 cable must be 1200m or
less.
(2) GOT side connector
For the GOT side connector, refer to the following.
1.4.1 GOT connector specifications
®
(3) MODBUS /RTU equipment side connector
Use the connector compatible with the MODBUS
equipment side module.
For details, refer to the MODBUS equipment user's
manual.

Connecting terminating resistors
(1) GOT side
Set the terminating resistor using the terminating
resistor setting switch.
For the procedure to set the terminating resistor, refer
to the following.
1.4.3 Terminating resistors of GOT
®
(2) MODBUS equipment side
/RTU
When connecting a MODBUS
GOT, a terminating resistor must be connected to the
®
MODBUS /RTU equipment.
For details, refer to the MODBUS
user's manual.
®
MODBUS /RTU
*3
®
/RTU equipment doesn't have SG. In this case, the wiring between GOT and SG is unnecessary.
1.4.3 Terminating resistors of GOT
®
/RTU equipment, refer to the manual of MODBUS
®
/RTU
®
/RTU equipment to the
®
/RTU equipment
*1*2*4
equipment side MODBUS
(1st)
(+)
(-)
SG
®
/RTU equipment may differ from the example shown above. SDA/B(+/-) and RDA/
4. MODBUS(R)/RTU CONNECTION
4.3 Connection Diagram
® *1*2*4
/RTU equipment side
(2nd)
(+)
(-)
SG
®
/RTU equipment.
4 - 7
4
®
/