Siemens AC75 manual Using the Pulse Counter in Start-Stop Counter Mode

AC75 AT Command Set

20.9 AT^SSCNT

s

3	The effect of value 3 depends on the selected counter mode:
	If AT^SCCNT, parameter <mode>= 0 (Start-Stop counter mode), then
	<action> type 3 stops the pulse counter and displays, as "^SSCNT" URC, the

number of pulses counted until this time.

If AT^SCCNT, parameter <mode>= 1 (Limit counter mode), then <action> type 3 immediately stops the pulse counter without indicating the "^SCCNT" URC. This action has the same effect as the command AT^SCCNT=0,0.

<pulse>(num)

Measurement result of the pulse counter in Start-Stop mode, indicated within the "^SSCNT" URC, if AT^SCCNT, parameter <action>=2 or 3. The value range of <pulse> is 32 bits (232-1).

0...4294967295 Number of pulses counted.

Note

•Measurement accuracy: In Start-Stop mode, you can achieve 100% accuracy if you take care that pulse trans- mission begins after the start command (AT^SSCNT=0 or 1) has returned OK and ends before the stop com- mand (AT^SSCNT=3) is issued.

20.9.1Using the Pulse Counter in Start-Stop Counter Mode

at^sccnt=1,0	Open pulse counter and enable Start-Stop counter mode.
OK	Reset and start pulse counter from 0.
at^sscnt=0
OK	Request value.
at^sscnt=2
OK	"^SSCNT" URC indicates number of pulses counted.
^SSCNT: 0000003254
at^sscnt=2	Request value.
OK	"^SSCNT" URC indicates number of pulses counted.
^SSCNT: 0000010024
at^sscnt=2	Request value.
OK	"^SSCNT" URC indicates number of pulses counted.
^SSCNT: 0000015134
at^sscnt=3	Request value and stop pulse counter.
OK	"^SSCNT" URC indicates number of pulses counted until this time.
^SSCNT: 0000021020
at^sscnt=2	Request value.
OK	"^SSCNT" URC still indicates the count of the last run.
^SSCNT: 0000021020
at^sscnt=1	Restart pulse counter at the value of the last run.
OK	Request value.
at^sscnt=2
^SSCNT: 0000022123	"^SSCNT" URC indicates number of pulses incremented from the last
	run.

AC75_ATC_V01.002	Page 520 of 569	10/30/06
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