2021.05.26
•
REV. 1
• DUAL-VALVE PRESSURE CONTROLLER OPERATING MANUAL
19
Streaming Mode
In streaming mode, your device automatically sends a line of live data at regular intervals. Only one unit on a COM port
may be in streaming mode at a time.
To put your pressure controller into streaming mode, type:
Begin streaming:
[unit ID]
@=@
Example:
A
@
=
@
(Begins streaming unit A)
This is equivalent to changing the unit ID to “
@
”. To take the pressure controller out of streaming mode, assign it a unit
ID by typing:
Stop streaming:
@@=
[desired unit ID]
Example:
@@=a
(stops and assigns unit ID of A)
When sending a command in streaming mode, the flow of data will not stop while the user is typing. This may make the
commands you type unreadable. If the device does not receive a valid command, the command will be ignored. If in
doubt, simply hit
and start again.
✓
Note:
The default streaming interval is 50 ms, but this can be modified by editing Register 91 while the device is in polling
mode:
Set streaming interval:
[unit ID]
w91=
[time in milliseconds]
Example:
aw91=500
(streams data every 500 ms)
Taring
Taring pressure ensures that the gauge or differential pressure sensor reads zero. Taring an absolute pressure sensor
requires a barometer and aligns the absolute pressure sensor with the external barometric pressure. For an accurate
tare, a gauge or absolute pressure sensor must be open to atmosphere, while both ports of a differential sensor must
be connected to the same pressure source (which may be atmosphere).
To tare a gauge or differential pressure device:
Tare gauge pressure:
[unit ID]
p
Example:
ap
To tare an absolute pressure device
Tare absolute pressure:
[unit ID]
pc
Example:
apc
Absolute pressure devices will return a
?
if the device is not configured with an internal barometer.
Collecting Data
Collect live 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 the unit ID is not present in streaming mode.
Example:
A +20.00 +20.00
ID Gauge Pressure
Setpoint
Single spaces separate each parameter, and each value is displayed in the chosen device engineering units (
).
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 columns, including status codes (
), may be present after the last number. The unit ID appears in
the data frame only when the device is in polling mode.
