34
Serial Communication
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 flow meter display (see
). You can query
the engineering units of the instant 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
to the right of the gas label column.
Streaming Mode
In the default polling mode, the screen should be blank except for a cursor.
Begin streaming:
[unit ID]
=@
Example:
a=@
Once you have established communication, and have a stream of information:
Stop the stream:
@@=A
(or using the RS-232 communication select menu,
select A as identifier and exit the screen)
Resume streaming:
A@=@
The flow of information will not stop while typing, and you will not be able
to read what you have typed. Also, the unit does not accept a backspace or
delete in the line, so it must be typed correctly. If in doubt, hit enter and start
again. Any command that is not understood will be ignored.
The device can also be set to streaming mode from the device front panel
by setting its Unit ID as
@
from the Comm Setup Menu (see
).
Streaming Mode – Advanced
The streaming data rate is controlled by register 91. The recommended
default rate is 50 ms, but it can be changed to a value from 1
–
65,535 ms,
or slightly over once per minute.
Below approximately 40 ms, data provision will depend on how many
parameters are selected. Fewer parameters will stream more quickly.
Reading register 91:
[unit ID]
r91
Modifying register 91:
[unit ID]
w91=
n
(where
n
is a positive integer from 1 to 65535)
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