20 Chapter 4
Vmnnnn
Backwards compatible with Series 4000
/
4100 flow meters.
Returns a volume measurement by integrating flow rate over time.
Denotes volume measurement
Denotes data format: A = ASCII, B = binary
Denotes maximum number of flow samples to integrate,
range is 1 to 9999
(“0500” denotes 500 readings, leading zeroes must be
included)
Example 1) VA2000
Request a single volume reading by integrating a maximum of 2000
flow samples and return data in ASCII format.
Volume data is returned in units of standard liters or volumetric liters
(see SUn command).
Before initiating this command, the sample interval, gas calibration,
and volume units should be set.
The sample interval between data points is set using the SSRnnnn
command.
The gas calibration is set using the SGn command.
The units of standard or volumetric is set using the SUn command.
The most common units are volumetric liters.
The data can be returned in either ASCII or binary.
If ASCII mode is chosen, the acknowledge sequence is “OK”
<CR><LF>. If the command generated an error, instead of “OK”
<CR><LF> being returned an error code “ERRn” <CR><LF> will be
returned where n represents an error code 0 through 9. See
Appendix A for a list of possible error codes. The termination
sequence is a <CR><LF>.
If binary mode is chosen, the acknowledge sequence is a single byte
0x00.
If the command generated an error, a single byte error code will be
returned instead of 0x00. See Appendix A for a list of possible error
codes. The reading is represented by 2 bytes. The most significant
byte is returned first. The data is represented as an unsigned integer
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