Table of Contents
Advertisement
Polling Mode
Polling mode and a unit ID of
each request. To poll your device, simply enter its unit ID.
Poll the device:
You can change the unit ID of a polling device by typing:
Change the unit ID:
The unit ID can be changed via the device's front panel
may be connected, as long as each unit ID is unique.
Streaming Mode
In streaming mode, your device automatically sends a line of live data at regular intervals. Only one unit on a given COM
port may be in streaming mode at a time. To put your device into streaming mode, type:
Begin streaming:
This is equivalent to changing the unit ID to "
Stop streaming:
When sending a command to a device 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, it will ignore it. If in doubt,
simply hit
and start again.
The default streaming interval is 50 ms, but this can be increased by changing Register 91 while the device is in polling mode:
Set streaming interval:
Taring
Before collecting flow data, be sure to tare your meter.
Manual taring can be accomplished through two separate commands for flow and pressure. Taring flow sets the zero
flow reading and must be done when no flow is passing through the flow meter:
For devices equipped with a barometer, the second tare aligns the internal absolute pressure sensor with the barometer
reading and must be done with the flow meter open to atmosphere:
Tare absolute pressure:
Collecting Data
Collect live flow data by typing the
for live flow measurements appears in the format below, but the unit ID is not present in streaming mode.
A
+13.542
ID
Absolute Pressure Temperature
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:
Additional columns, including status codes
the data frame only when the flow meter is in polling mode.
2022.11.18 • REV. 1 • MASS FLOW METER OPERATING MANUAL
A
is default, unless otherwise requested. Polling the device returns a single line of data for
[unit ID]
Example: a
(polls unit A)
[current unit ID]@=[desired unit ID]
Example: a@=b
(changes unit A to unit B)
[unit
ID]@=@
Example: a@=@
(puts device A into streaming mode)
@
". To take the flow meter out of streaming mode, assign it a unit ID by typing:
@@=[desired unit ID]
Example: @@=a
(stops and assigns unit ID of A)
[unit ID] w91=[number of ms]
Example: aw91=500
[unit
ID]v
Tare flow:
Example: av
(sets flow reading to zero)
[unit
ID]pc
Example: apc
(requires optional barometer)
[unit ID]
command or by setting your flow meter to streaming. Each line of data
+24.57
+16.667
Volumetric Flow
[unit
ID]??d*
Example: a??d*
(returns the data frame descriptions)
(page
(page
16). Valid unit IDs are letters A–Z, and up to 26 devices
(streams new data every 500 ms)
+15.444
N2
Mass Flow
Gas
6), may be present after the last number. The unit ID appears in
(page
15).
19
Advertisement
Table of Contents
