Measurement Specialties 9116 - Manual (Page 58)

Pressure Systems, Inc. Model 9116 User’s Manual
Page 49 www.PressureSystems.com
channels. Following completion of the acquisition and EU conversion cycle, the
module will also deliver the requested data channels to the host. In this manner,
users are provided with highly synchronized data acquisition and delivery from
one or more modules. If a module waits in the idle mode for an extended period
of time without receiving a data request, it will periodically initiate its own internal
data acquisition cycles so as to update internal thermal coefficients.
When all hardware triggered streams are complete or aborted, an individual
module will return to the default mode of continuous scanning and EU
conversion.
When the internal software timer is used to control host stream output rates
(sync=1), note that internal clock frequency variances will result in slightly
different timing between modules. Although these differences in timing are slight,
they may result in noticeable differences in output timing between modules over
a long period of time. If highly synchronized data output is required from multiple
modules, the hardware trigger mode should be used.
The period ‘per’ parameter is a positive decimal integer count (from 0 to
2147483647, specified with 1 to 10 numeric digits as needed), and its meaning
depends on the sync type ‘sync’ parameter described above.
‘sync’ meaning of ‘per’
0 number of hardware trigger periods to wait before sending each packet
1
delay period (in milliseconds) to wait before sending each packet
NOTE: minimum is 2 milliseconds and the granularity is 2 milliseconds
with values rounded down to the nearest 2 milliseconds.
The ‘f’ parameter identifies the format of each selected acquired datum in each
stream packet, and is a single numeric digit. Valid format codes are listed in the
following table:
f converts each internal selected acquired datum value from . . . max. char.
0 single binary float to 7-10-digit signed decimal “ [-xxx]x.xxxxxx” 13
1 single binary float to 8-digit hex integer “ xxxxxxxx” 9
2 double binary float to 16-digit hex integer “ xxxxxxxxxxxxxxxx” 17
5 single binary float to long integer (EU*1000) then to 8-digit hex integer 9
7 single binary float to single binary float (big endian: msb first) 4
8 single binary float to single binary float (little endian: lsb first) 4
Unless the EU conversion scalar is altered, the returned pressure data will be in units of psi.
(See command ‘v’, array 11, coefficient 01 for other units.