7 - 26
7.3 Connection Diagram
(4) RS-422 connection diagram 4)
■2.
Precautions when preparing a cable
(1) Cable length
The length of the RS-422 cable must be within the maximum distance.
(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 PLC to the GOT, a terminating resistor must be connected to the GOT.
(a)
For GT27, GT25(Except GT2505-V), GT23
Set the terminating resistor setting switch of the GOT main unit to "Disable".
(b)
For GT2505-V, GT21
Set the terminating resistor selector to "330
Ω
".
For the procedure to set the terminating resistor, refer to the following.
➠
1.4.3 Terminating resistors of GOT
(2) Serial communication module or computer link module side
Connect the terminating resistors (330
Ω
1/4W (orange/orange/brown/ ) ) on the serial communication module or
computer link module side. For details, refer to the following manual.
➠
User's Manual for the serial communication module or computer link module
(a)
Other than A2CCPUC24(-PRF)
Connect the terminating resistors supplied with the module across RDA and RDB.
(b)
A2CCPUC24(-PRF)
Set TXD and RXD on the terminating resistor setting pin to "A".
GOT side
(connector
terminal block)
Unfastened cable color of
GT21-C
R4-25P5
Brown
Red
Orange
Yellow
Green
SDA
SDB
RDA
RDB
SG
Summary of Contents for GOT2000 Series
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