Mitsubishi Electric GOT2000 Series Connection Manual page 293

(2) RS-422/485 connection diagram 2)
GOT side(slave) *3
(2nd)
SDA1(TXD1+) *5
6
SDB1(TXD1-) *5
8
RDA1(RXD1+) *5
10
RDB1(RXD1-) *5
R
12
*3
SG
2
NC
1
NC
3
NC
4
SDA2(TXD2+)
5
SDB2(TXD2-)
7
RDA2(RXD2+)
9
RDB2(RXD2-)
11
NC
13
RSA(RTS+)
14
NC
15
RSB(RTS-)
16
NC
17
CSA(CTS+)
18
NC
19
CSB(CTS-)
20
*1 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.
*2 Some MODBUS/RTU master equipment don't have SG. In this case, the wiring between GOT and SG is unnecessary.
*3 A terminating resistor is required for the terminal GOT. Set the terminating resistor selector of the main unit to "Disable" and
connect a 110 Ω terminating resistor.
➠
1.4.3 Terminating resistors of GOT
*4 For the terminating resistor of MODBUS/RTU master equipment, refer to the manual of MODBUS/RTU master equipment to be
used.
*5 Use the twisted pair cable for SDA1/SDB1.
(3) RS-422/485 connection diagram 3)
*3
GOT side(slave)
(2nd)
SDA
1
R
SDB
6
*3
RDA
2
R
RDB
7
*3
SG
5
RSA
3
RSB
8
CSA
4
CSB
9
*1 Some MODBUS/RTU master equipment don't have SG. In this case, the wiring between GOT and SG is unnecessary.
*2 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.
*3 A terminating resistor is required for the terminal GOT. Set the terminating resistor selector of the main unit of GT27 and GT25 to
"Disable" and connect a 330 Ω terminating resistor.
Set the terminating resistor selector of the main unit of GT21 to "330 Ω".
➠
1.4.3 Terminating resistors of GOT
*4 For the terminating resistor of MODBUS/RTU master equipment, refer to the manual of MODBUS/RTU master equipment to be
used.
GOT side(slave) *3
(1st)
SDA1(TXD1+) *5
6
SDB1(TXD1-) *5
8
RDA1(RXD1+) *5
10
RDB1(RXD1-) *5
12
SG
2
NC
1
NC
3
NC
4
SDA2(TXD2+)
5
SDB2(TXD2-)
7
RDA2(RXD2+)
9
RDB2(RXD2-)
11
NC
13
RSA(RTS+)
14
NC
15
RSB(RTS-)
16
NC
17
CSA(CTS+)
18
NC
19
CSB(CTS-)
20
*3
GOT side(slave)
(1st)
SDA
1
SDB
6
RDA
2
RDB
7
SG
5
RSA
3
RSB
8
CSA
4
CSB
9
7.3 Connection Diagram
MODBUS /RTU master equipment side
RDA(+)
RDB(-)
SDA(+)
SDB(-)
SG
MODBUS /RTU master equipment side
RDA(+)
RDB(-)
SDA(+)
SDB(-)
SG
*1*2*4
7
*1*2*4
7 - 7