Pressure Systems 98RK-1 - Manual (Page 64)

Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 62 www.PressureSystems.com
internal 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 the 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 characters as needed). Its meaning
(described in the following table) 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 between sending each
packet NOTE: minimum is 10 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, returned pressure data will be in units of psi. See
command 'v', array 11, coefficient 01 for other units.