JF-1A Conductivity Sensor
A440-009
Page 18 of 56
FEBRUARY 2009
11.1 RUN MODE
When powered the unit commences operation in the “RUN MODE.” The unit
sends the following sign on ASCII message at 9600 Baud, 8 Data Bits, No Parity
and 1 Stop bit:
(Note: Orator Text Used For All Instrument Outputs)
D-2 Incorporated
Fuel Cell JF1
1.6
COND, TEMP, COMP COND
(ps/m) (C) (ps/m-C)
The last two lines are headers for the data output columns. To collect data the
user need only send an ASCII Carriage Return (Hex 0A) <CR> or ASCII Line
Feed (Hex OD) <LF>. The unit will respond with a single line of data:
13.0, 15.4, 23.8<CF><LF>
Where: 13.0 = Conductivity Measured
15.4 = Temperature of Fuel in Celsius
23.8 = Compensated Conductivity
11.2 CONTINUOUS DATA
To have the unit send data continuously without polling, the user can send the
“SC” Set Continuous Command. The unit will commence sending data at the
data rate and current averaging rate. If the averaging is set to 1 sample then
the data rate is approximately 2.0 hertz. If the averaging is set to 2 samples
then the 2 samples are averaged together and the data rate is 1 hertz. Boxcar
averaging is used, i.e., Data Average = 1/N New Data + N-1/N Old Data. To
stop continuous data the unit will only accept one command, which is the capital
“S” Stop Command followed by a carriage return or line feed.
Note: The Stop Command is the only case sensitive command!
11.3 OPEN MODE
In OPEN MODE the unit stops collecting data and awaits user instructions such