34
Serial Communication
Taring
Be sure to tare your pressure controller before collecting data. If auto-tare
is enabled, provide a zero setpoint until auto-tare activates, usually after
a few seconds, depending on the device’s full-scale pressure.
The controller can also be tared from the front panel. See
Serial commands can be used to manually tare the device:
Taring pressure
aligns the internal gauge pressure sensor with the current
barometric pressure, and must be done with the pressure controller open
to atmosphere. Taring a differential pressure controller (
) zeros
the differential pressure reading between the two measured points in the
system as equal.
Tare gauge pressure:
[unit ID]
p
Example:
ap
✓
Absolute pressure devices cannot tare.
Collecting Pressure Data
Collect live pressure data by typing the
[unit ID]
command or by
setting your pressure controller to streaming. Each line of data for live
measurements appears in the format below, but Unit ID is not present in
streaming mode.
A 20.00 +20.00
ID Pressure Setpoint
Single spaces separate each parameter, and each value is displayed in the
chosen device engineering units, which may differ from the engineering
units visible on the pressure controller display (see
). You can
query the engineering units of the serial data frame by typing:
Query live data info:
[unit ID]
??d*
Example:
a??d*
(returns the data frame descriptions)
Additional information, including status messages (
), may be
present at the end of the line.
