28 Rev. 2.4 (3/05)
Honeywell Analytics CM4 Protocol Manual
01: 0.0 < Concentration
10: AL1 <= Concentration
< AL2
11: AL2 <= Concentration
0xC0 - (2 bits) current alarm level
0x45 00: no alarm
01: alarm level 1 active
10: alarm level 2 active
(End of Point Structure)
Total size is 34 bytes
Example
The following example is an illustration of the above
packet using serial communication protocol version 2.
The address of the slave is 42 (0x2A). Point 1 is in a level
2 alarm, but the gas concentration has decreased below
AL2 and AL1 to 42.2 ppb. The other three points are
reading zero concentration. The instrument fault relay is
activated and point 4 is disabled because of loss of ow.
Both the Fault History and the Alarm History have new
entries which have not been read yet. Point 3 is
congured to be disabled via menu function 3.1. All four
ows are near the norm of 180 cc/min except for point
4, which is 139 cc/min.
Master: 40 2A 00 06 45 4B; inquiry
Slave: 40 00 2A 27 45 23 64 66 DA; header,
date/time
3D; unit status byte
3D 2C E2 19 00 BB 90; point 1 data
00 00 00 00 00 BD 00; point 2 data
00 00 00 00 00 C4 03; point 3 data
00 00 00 00 00 8B 0A; point 4 data
5E; checksum
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