Appendix A Gpu Communication Protocol; Introduction; Command Records - Honeywell CIU 888 Protocol Manual

APPENDIX A GPU COMMUNICATION PROTOCOL

Part No.: 4417589_Rev13
Appendix A - GPU Communication Protocol
A.1 Introduction
The CIU 888 uses a communication protocol based on a request/reply
schedule. The protocol consists of command records and answer
records.
A record consists of a data field packed in an envelope. The envelope
allows the receiver to detect the incoming record and to verify its proper
reception.
A record consists of the following items:
STX DATAFIELD
Item
STX
DATA FIELD
ETX
BCC
The general form of a communication record is as follows:
STX ADDRESS(ES)
A.2 Command records
The following records can be sent to the CIU.
CIU individual command records, see section A.2.1

Instrument individual command records, see section A.2.2

Instrument group command records, see section A.2.3

Protocol Manual - CIU Emulation
CIU 888
ETX BCC
Description
Start of Text Character (ASCII value 02)
Data field packed in an envelope
End of text character (ASCII value 03)
Block Check Character
TOI TOR (DATA) ETX BCC
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