Modbus Emulation In A Redundant Setup; Emerson Rex Gauge Configuration Through Host Port - Honeywell CIU 888 Protocol Manual

NOTE: Refer to the Configuration Manual CIU 888 (Part No. 4417584) for more
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Modbus Emulation
Modbus Mode
Modbus Slave and Modbus
Emulation

3.2 Modbus Emulation in a redundant setup

If two CIU 888s are configured as a redundant pair and Modbus
Emulation is enabled, Modbus RTU tunnel requests sent to the
secondary CIU 888 will be ignored.
information about redundancy.

3.3 Emerson Rex Gauge Configuration through host port

A PC/laptop with TankMaster Winsetup installed is needed. TankMaster
Winsetup is a software tool designed to configure, commission and
service Emerson Rex Gauges. The PC/laptop is connected to CIU 888's
serial host port and the serial host port is configured for Modbus
Emulation.
Perform the following steps to configure Rex Gauges via CIU 888:
1. Connect the PC/laptop with TankMaster Winsetup installed to the
serial host port of CIU 888 using RS-232 / RS-485 cable.
Protocol Manual - CIU Emulation
CIU 888
Description
This mode is used when we have limited number of
host ports in CIU 888 and there is no host port dedi-
cated for Modbus Emulation. In this mode, Entis Pro /
SCADA / DCS / PLC and TankMaster Winsetup can
be connected a host port one at a time without any
CIU 888 configuration change.
In this mode, CIU 888 acts as a Modbus Slave for the
Modbus requests with RTU address of the CIU 888's
host port and CIU 888 acts as a Modbus tunnel and
passes others Modbus requests from TankMaster
Winsetup to the Emerson Rex gauges.
Part No.: 4417589_Rev13