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Page B-12
LiQuilaz II E and S Operations Manual
Appendix B RS-485 Communication Protocol
CHANNEL 1 is the channel with the smallest size threshold. CHECK_SUM is a 16-bit
unsigned summation of all bytes. The STX and ETX characters are not included in the
checksum. The carry-bit is ignored if overflow occurs during calculation of the
checksum.
Each device responds with the STX character of a report within approximately 1
second of the receipt of its address. If no response is received within this time, a time-
out fault condition should be assumed by the host computer.
Example:
NOTE:
All numbers are in hexadecimal.
Address transmitted by Data Display System -> 81
Response from LiQuilaz II-E20 ->
0281000000000100FF7F000F000000000000000000000000000000000000000000000000000000000000900103
This LiQuilaz II-E20 responded with the following information:
STX
-> 02
ADDRESS
-> 81
SAMPLE_INTERVAL
-> 00000000
LASER/FLOW STATUS
-> 01
SAMPLE_STATUS
-> 00
DC_LIGHT
-> FF7F00
= 00FFHEX
NUMBER_CHANNELS
-> 0F
CHANNEL1
-> 00000000
CHANNEL2
-> 00000000
CHANNEL3
-> 00000000
CHANNEL4
-> 00000000
CHANNEL5
-> 00000000
CHANNEL6
-> 00000000
CHANNEL7
-> 00000000
CHANNEL8
-> 00000000
CHANNEL9
-> 00000000
CHANNEL10
-> 00000000
CHANNEL11
-> 00000000
CHANNEL12
-> 00000000
CHANNEL13
-> 00000000
CHANNEL14
-> 00000000
CHANNEL15
-> 00000000
CHECKSUM
-> 9001
= 190 HEX
ETX
-> 03
Содержание Particle Measuring Systems LiQuilaz II E
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