Pressure Systems user manual Pressure Systems, Inc 98RK-1 & 9816 User’s Manual

Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©

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

0number of hardware trigger periods to wait before sending each packet

1delay 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	9
			integer
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.

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