Scanivalve MPS4232 - Scanning; Scan Rate; Scan Duration; Scan Data Format

16
MPS4232
Section 3: Operation
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Once the MPS module has been installed, powered on and
allowed to thermally stabilize, data can be collected. There
are several conguraon variables that control how the
MPS module samples pressure and how the data is output.
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The scan rate is controlled by the variable: RATE. Rate
is expressed in Hertz (Hz), which can be described as
samples per channel per second, or more simply, frames
per second. Because the MPS has one analog-to-digital
converter per transducer, all pressure samples per channel
will be taken synchronously.
Example: If rate is set to 10Hz, the MPS will sample a pres-
sure value from each channel every 0.1 seconds. This data
is packaged into a ‘frame of data‘ and output to the cong-
ured desnaon.
Note: Max scan rates can be limited based on data desna-
on, format, and conguraons. See Appendix C, Table 1
for all scan rate limitaons.
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The length of the scan, or number of frames output per
scan, is controlled by the variable: FPS. A frame of data
typically consists of a frame number, me stamp, and one
averaged pressure and temperature sample for each sensor
in the MPS.
Example: If frames per second is set to 100, and the scan
rate is set to 10Hz, the MPS will output 100 frames of data
at 10Hz. This scan will last 10 seconds and only 100 frames
of data will be output. The scan will end when 100 frames
are output.
Example: If frames per second is set to 0, and rate is set to
5Hz, the MPS will output data at 5Hz indenitely. The scan
must be stopped manually by the user.
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The data output for ASCII and Binary data collecon is
controlled by the variable: FORMAT. Format is split into
three secons; Telnet, FTP/UDP, and Binary Server.
Example: If format is set to C (CSV), the MPS will output the
scan data in a Comma Separated Variable ASCII format.
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The pressure and temperature unit values output in each
frame of data are controlled by the variable: UNITS. The
MPS supports a number of pressure engineering units
including PSI, Pascals, Bar, and more. Temperature is
limited to degrees Celsius.
Example: If units is set to PSI, the pressure values for each
channel will be output in PSI engineering units, and the
temperature for each channel will be in degrees Celsius.
Example: If units is set to RAW, the pressure values for each
pressure and temperature channel will be output in raw
A/D counts (used for troubleshoong).
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Once the MPS has been congured for scanning, the MPS
will start sampling and outpung data aer the SCAN
command is issued to the MPS module. The MPS will then
enter ‘scan’ mode and will output data at the congured
rate unl the frames per scan (FPS) term is met or unl
the user has manually stopped the scan. Once the scan
has been completed or terminated, the MPS will return to
‘ready’ mode and will be ready for the next command. The
scenario above is an example of a free-run, internal rate
scan (TRIG 0). Data will be output from the MPS module
over the Ethernet connecon and can be collected in the
ASCII format.
There are several ways that the MPS can scan and collect
data. These opons include:
• Internal rate, soware scan triggered
• Internal rate, hardware scan triggered
• External rate, hardware frame triggering
• External rate, soware frame triggering
• Internal rate, scan-on-startup
• Internal rate, PTP me triggered
There are several ways that the MPS can output scan data.
These opons include:
• ASCII data via TCP or FTP
• Binary data via TCP, UDP, or FTP
These opons make the MPS an extremely versale and
congurable unit. All dierent scanning and data output
methods will be described in this manual. For more infor-
maon on the commands used in this secon, please refer
to Secon 5: Soware.
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The MPS4200 can be congured to scan with an external
hardware or soware trigger. This provides a simple means
of synchronizing the data collecon between mulple MPS
units or legacy Scanivalve products when a IEEE-1588 PTP
infrastructure is not in place. It also provides a means of
synchronizing MPS scanners with other, third-party equip-
ment that may not be IEEE-1588 PTP compable.