Mitsubishi Electric GOT2000 Series Connection Manual page 77

(4) RS-422 connection diagram 4)
(5) RS-422 connection diagram 5)
■2. Precautions when preparing a cable
(1) Cable length
The distance between the GOT and the PLC of connection diagram 1), 2) and 3) must be 1200 m or less.
The length of the RS-422 connection diagram 4) or RS-422 connection diagram 5) must be 30m or less.
(2) GOT side connector
For the GOT side connector, refer to the following.
➠ 1.4.1 GOT connector specifications
■3. Connecting terminating resistors
(1) GOT side
When connecting a microcomputer to the GOT, a terminating resistor must be connected to the GOT.
(a) For GT27,GT25,GT23
Set the terminating resistor setting switch of the GOT main unit to "Disable".
(b) For GT21
Set the terminating resistor selector to "330Ω".
For the procedure to set the terminating resistor, refer to the following.
➠
1.4.3 Terminating resistors of GOT
GOT side (n-th)
(terminal block)
RDA
RDB
SDA
SDB
SG
CSA
CSB
RSA
RSB
GOT side (n-th)
TXD+(SDA)
1
RXD+(RDA)
2
RTS+(RSA)
3
CTS+(CSA)
4
SG
5
TXD-(SDB)
6
RXD-(RDB)
7
RTS-(RSB)
8
CTS-(CSB)
9
POINT POINT POINT
The polarity A and B in signal names may be reversed depending on the microcomputer to be
used.
Prepare a cable according to the microcomputer to be used.
GOT side (n+1th)
(terminal block)
SDA
SDB
RDA
RDB
SG
GOT side (n+1th)
RXD+(RDA)
2
TXD+(SDA)
1
CTS+(CSA)
4
RTS+(RSA)
3
SG
5
RXD-(RDB)
7
TXD-(SDB)
6
CTS-(CSB)
9
RTS-(RSB)
8
2.3 Connection Diagram
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