Honeywell CIU 888 Protocol Manual page 36

REMARK: The value referring to the CIU address (i.e. 'N') will not be part of the GPU
A- 2
Appendix A - GPU Communication Protocol
A.2.1 CIU individual command record
This command is executed in the addressed CIU, which sends back an
answer record.
STX N
Item Position(s)
STX 1
N 2
TOI 3
TOR 4
ETX 5
BCC 11
A.2.2 Instrument individual command record
The CIU will pass on these records (without the CIU address) to any
connected field instrument.
STX N
Field Position(s)
STX 1
N 2
nn 3, 4
TOI 5
TOR 6
ETX 7
BCC 8
commands in case of TCP/IP communication.
Protocol Manual - CIU Emulation
CIU 888
TOI TOR ETX
Description
Start of Text Character (= Start of transmission)
CIU address (0-9)
R CIU-GPU version
X Send identify record
End of Text Character (End of transmission)
Block Check Character
nn TOI TOR
Description
Start of Text Character (Start of transmission)
CIU address (0-9)
Instrument address (00-99)
Type of Instrument:

B = 811, 854, 873 instrument with GPU protocol
and instruments with Gauge type B

C = Instruments with Gauge type C

E = 811 instrument with external alarms and
instruments with Gauge type E

@ = Any type
Type of Record
See the Protocol Manual of the related field instrument
for more information.
End of Text Character (End of transmission)
Block Check Character
BCC
ETX BCC
Part No.: 4417589_Rev13