Measurement Specialties
KPSI
®
Digital Series User’s Manual
Page 11
www.Meas-Spec.com
starting a non-concurrent measurement (M[v] command)
The original command to tell the sensor to start a measurement non-concurrently is:
aM[v]!
Where “a” is the
address
character, and “M[v]” is
a Start Non-Concurrent
Measurement
command. An optional digit “v” identifies command
variations
.
Most data recorders will issue this command and automatically handle the reply to collect data.
You can also issue the command yourself. In reply, the sensor will respond with:
atttn
Acknowledges it is from sensor with address “a”, that “ttt” seconds are required before
the measurement is completed, and “n” values will appear in final data stream
acquired.
When the measurement is complete, the sensor sends a second response, called a
Service
Request:
a Where
Service Request
response contains only “a,” the
address
of the sensor.
Note that you still have no data from the sensor. To get data, enter the
Get Data
command to
sensor:
aD0!
Where “a” is the
address
character and “D0” is the command to retrieve measured
data. Note: The
number zero
follows “D,” not the
letter
“O”.
Depending on the
variation
of the command, the sensor will reply with one of these response
formats:
av
avu
avvv
Where “a” is the
address
, “v” is a
data value
, and “u” is an optional
units
indicator.
Both “v” and “u” have the format of a polarity sign (+ or -) followed by up to seven
digits, including a decimal point. Format returned depends on the command variation.
The “u” indicates the
units
of the measurement according to the following tables:
0
units are feet of water
1
units are psi
2
units are kilopascal
3
units are cm of water
4
units are meters of water
5
units are mm of water
9
units depend on user-entered scale factors (slope and offset).
