Measurement Specialties
KPSI
®
Digital Series User’s Manual
Page 14
www.Meas-Spec.com
As in all of the other (non-CRC) “M” and “C” commands, a
“D0”
command must eventually be
issued to get the data from the sensor. In its response, three data measurements and a CRC
appendage are returned as follows:
a+3.14+2.718+1.414Ipz
where (“
Ipz”
) is the three-character CRC code appendage.
other non-concurrent measurements
The SDI standard allows for several other
measurement
command variations, such as “
M1
,”
“
M2,
” and the like. The sensor supports the following ones:
aM1!
Measure psi using factory calibration. Does not apply user scaling, field calibration,
or offsets. Returns 1 value and the units are fixed to psi.
aM2!
Measure temperature (Celsius or Fahrenheit). This returns two values: the
temperature and the units. The units will be 0 for Celsius and 1 for Fahrenheit.
aM3!
Measure scale factors: user
slope
, user
offset
, and field calibration
offset
. Use this if
you want to view user-entered values that can affect the value returned.
aM4!
Measure calibration lab slope and offset. Use this if you want to view the calibration
lab values that can affect the value returned.
aM5!
This command requests
high accuracy PCB
(printed circuit board)
temperature.
aM6!
This command requests
battery voltage
.
aM7!
This command combines M0 and M2 for both pressure and temperature.
Remember to issue the “
D0
” command after the measurement is complete (as signaled by extra
Service Request
response), in order to retrieve the data.
