Halma ALICAT IM, Руководство по эксплуатации

Страница: 10 / 19

10 Control
simply enter its unit ID (see the Data Format on
page 10
).
Poll the device: unit_id

Example: a

(polls unit A)
You can change the unit ID of a polling device by typing:
Change the unit ID: current_unit_id @= desired_unit_id

Example: a@=b

(changes unit A to unit B)
Streaming Mode
In streaming mode, your device automatically sends a line of live data at regular intervals.
(see the Data Format on page 10 ).
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: unit_id @=@

Example: a@=@

(puts device A into streaming mode)
This is equivalent to changing the unit ID to “ @ ”.
To take the flow controller out of streaming mode, assign it a unit ID by typing:
Stop streaming: @@= desired_unit_id

Example: @@=a8 (stops and assigns unit ID of A)
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, hit

and start again.
The default streaming interval is 50 ms. This can be increased by changing Register 91
while the device is in polling mode:
Set streaming interval: unit_id W91= number_of_ms

Example: aW91=500

(streams new data every 500 ms)
Data Format
Each line of data for live flow measurements appears in the format below, but the unit ID
is not present in streaming mode.
Controller
A +15.542 +24.57 +16.667 +15.444 +15.444 +81.23 22741.4 N2
ID Abs. Pressure Temp. Vol. Flow Mass Flow Setpoint Valve Drive Totalizer Gas
Meter
A +15.542 +24.57 +16.667 +15.444 22741.4 N2
ID Abs. Pressure Temp. Vol. Flow Mass Flow Totalizer Gas
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 may be present to the right of the Gas Label column.
Changing the Setpoint
The setpoint is the flow rate that the controller attempts to achieve and maintain by