Appendix A - GPU Communication Protocol
Part No.: 4417589_Rev13 Protocol Manual - CIU Emulation
CIU 888 A - 3
A.2.3 Instrument group command record
The instrument group commands are transmitted (without the CIU
address) to every connected instrument.
REMARK: The value referring to the CIU address (i.e. ‘N’) will not be part of the GPU
commands in case of TCP/IP communication.
A.3 CIU answer records
The following records are transmitted to the computer system after
reception of a CIU individual command record.
STX N n n TOI TOR ETX BCC
Field Position(s) Description
STX 1 Start of Text Character (Start of transmission)
N 2 CIU address (0-9)
nn 3, 4 Instrument address (00-99):
** = The command is intended for all connected
instruments.
*n = The command is intended for all instruments
ending with instrument address n.
n* = The command is intended for all instruments
starting with instrument address n.
TOI 5 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
TOR 6 Type of Record
See Protocol Manual of the related field instrument for
more information.
ETX 7 End of Text Character (End of Transmission)
BCC 8 Block Check Character
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