Page B-6
LiQuilaz II E and S Operations Manual
Appendix B RS-485 Communication Protocol
Detailed Description of Slow Protocol Commands and Responses
CMODE n
Selects either time-based sampling for in-situ applications, or sampler-based
sampling. When n = 1, time-based mode is selected. When n is other than 1, sampler-
based sampling is selected. The default is time-based sampling.
In sampler-based mode, the LiQuilaz II Liquid Particle Counter will begin a sample
and accumulate counts whenever the hardware sampling control line is asserted. A
sample is ended in this mode when the hardware sampling-control line is
unasserted.
In time-based mode, the LiQuilaz II Liquid Particle Counter continuously collects
samples using the duration set with the CSI command. The CSS command starts the
sample process.
CSI n
Sets the sample interval, in seconds, for time-based sampling. 1 < n < 28800.
CDT yyyy/mm/dd/ hh:mm:ss
Sets date and time for the LiQuilaz II. If the instrument is sampling when this
command is issued, the sample will be aborted and the LiQuilaz II will stop
sampling.
CTD
Transmit the report currently on the top of the transmission queue. The detailed
format of the report is shown below.
(Note that this is the unformatted data report.)
<STX>
Begin report flag. The STX character is 2.
ADDRESS
Address of responding LiQuilaz II. Range between 1 and 99.
RTD <LF>
TI hh:mm:ss <LF>
Time the data was taken. This is the start of the sample
interval.
DA yy/mm/dd <LF>
Date the sample was taken.
NC n <LF>
Number of channels. 0 < n < 31.
SI n.n <LF>
Length of the sample interval. The sample interval will be
between 0.0 and 85899345.49.
L0 n <LF>
bit n.1 = Laser Status 1 = Laser Good
Status 0 = Laser Bad
bit n.2 = Not Used
bit n.3 = Flow Rate 1 = Flow Rate Good
Flow Rate 0 = Flow Rate Bad
bit n.4 = Not Used
bit n.5 = Not Used
bit n.6 = Not Used
bit n.7 = Not Used
bit n.8 = Not Used
NOTE: Bit n.3, the sample signal line for the sample-based
mode, is only valid in the time-based mode.
