User Manual

Commissioning
Part No.: 4417.762_Rev07 SmartRadar FlexLine
Service Manual 6 - 5
6.3 Enraf GPU-FlexConn / Modbus Protocol (HCI-GPU)
6.3.1 Introduction
The Host Communication Instrument - Gauge Processing Unit (HCI-
GPU) board is a communication module for the instrument (gauge).
ESF07-0006a
FIGURE 6-2 The HCI-GPU board
The HCI-GPU can communicate with any hosts via three different
communication protocols:
 The Enraf GPU protocol with its records and items (limited);
 The Enraf FlexConn protocol with its so-called entities;
 The Modbus protocol.
In the first situation the CAN-RS module behaves like an Enraf GPU
slave, communicating via the Enraf GPU protocol. If a valid record or
item is received, a related FlexConn message type A will be issued to
the CAN-bus for obtaining the desired data.
In the second situation, when production-, test-, configuration-, and
service tools are used, the FlexConn protocol must be used via the
RS232/485 physical layer.
In the third situation the CAN-RS module behaves like a Modbus slave
communicating via the Modbus protocol.
JP7 = RS-485 terminator
JP8 = +5 V-ISO enable on CN2
JP9 = RS-422 terminator