Honeywell CIU 888 Protocol Manual

Preface
Part No.: 4417589_Rev13 Protocol Manual - CIU Emulation
CIU 888 i
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PREFACE
General
In order to support backward compatibility with earlier generations in the
CIU series, the CIU 888 features a CIU Emulation component. This
component enables host systems connected to the CIU 888 to
communicate via the CIU 888 using the GPU protocol on serial
(RS-232/RS-485) instead of the Modbus protocol.
Similarly, the virtual tunnel component of the CIU 888 enables service
tools, such as Engauge, to communicate with tank gauges via the
CIU 888 using the GPU protocol on TCP/IP.
NOTE: The virtual tunnel component also enables communication through
Honeywell’s proprietary FlexConn protocol on TCP/IP. This protocol will not be
described further in this manual.
The Modbus Emulation component of the CIU 888 enables the
Emerson servicing tool (TankMaster Winsetup) to communicate with
Emerson Rex gauges through the CIU 888 using the Modbus RTU
protocol on the serial (RS232/RS485) hostport.
Purpose of this manual
The purpose of this manual is to give information about CIU Emulation
and virtual tunnel, and modbus emulation as implemented in the
CIU 888. In addition, this manual provides a general description of the
GPU protocol.
Target audience of this manual
This manual is primarily intended for:
 Service technicians who are responsible for setting up
(commissioning) and configuring the CIU 888, and for configuring
gauges via the CIU 888 using service tools such as Engauge and
TankMaster Winsetup
 System integrators who are responsible for designing and verifying
the customer’s system in which the CIU 888 is the tank gauging
component

Honeywell CIU 888 Specifications

General

Brand	Honeywell
Model	CIU 888
Category	Recording Equipment
Language	English