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All Rights Reserved. Copyright © 2003, Yokogawa Electric Corporation
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GS 05D01D12-02E 4th Edition Mar. 01, 2005-00
● Communication Functions (Optional Function )
The communication function, provided with the instrument,
allows connection to a personal computer, programmable
logic controller, and other controllers.
Communication protocol
Computer link communication:
Communication protocol with a personal
computer.
Ladder communication:
Communication protocol with program-
mable logic controllers.
MODBUS communication:
Communication protocol with a personal
computer or PLC.
Coordinated operation:
Communication protocol for coordinated
operation with two or more GREEN series
controllers. The UT321 can be connected as
a master station or a slave station.
Communication interface
Communication protocol:
Computer link, ladder communication,
MODBUS communication or coordinated
operation
Standards: EIA RS-485
Maximum number of connectable controllers:
31 GREEN series controllers
Maximum communication distance: 1,200 m
Communication method:
Two-wire half duplex or four-wire half-
duplex, start-stop synchronization, non-
procedural
Communication rate:
600, 1200, 2400, 4800, or 9600 bps
Personal computer
UT351/UT321
Digital indicating controller
UP351 Program controller
or UT351/UT321 Digital indicating controller
UT351/UT321
Digital indicating controller
UT351/UT321
Digital indicating controller
(1) Computer link communication/MODBUS communication (2) Ladder communication
(3) Coordinated operation
PLC
Examples of Communication System Configuration Diagram
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