Preface; Purpose Of This Manual; Target Audience Of This Manual - Honeywell CIU 888 Protocol Manual

NOTE: The virtual tunnel component also enables communication through
Part No.: 4417589_Rev13

Preface

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.
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

(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
Protocol Manual - CIU Emulation
CIU 888
who are responsible for setting up
i