Siemens AC75 manual Using the Pulse Counter in Limit Counter Mode

AC75 AT Command Set

20.8 AT^SCCNT

s

<mode>(num)

0	Activates the Start-Stop counter mode.
	After setting this mode, use AT^SSCNT and the <action> parameter to start
	or stop the pulse counter or to read out the measured pulses.
1	Activates the Limit counter mode and immediately starts the pulse counter.
	Parameter <limit> is mandatory for this mode.
<limit>(num)
1...65534	Number of pulses to be counted.
	Parameter <limit> applies only to the Limit counter mode and is mandatory
	for this mode. Once the given number of pulses is reached, the ME sends one
	single URC "^SCCNT" which indicates the parameter <time>.
<time>(num)
1...4294967295	Time (in milliseconds) taken to count the number of pulses specified with
	<limit>.

Note

•Measurement accuracy: In Limit counter mode, the parameter <time> implies an inaccuracy <5ms.

20.8.1Using the Pulse Counter in Limit Counter Mode

This example assumes that a 1 kHz frequency is applied at the GPIO10 pin. Limit counter mode is enabled to request the time the pulse counter needs to count a specified number of pulses.

at^sccnt=1,1,1000	Open pulse counter, enable Limit counter mode, request the time
	needed to count 1000 pulses.
OK	"^SCCNT" URC indicates the time taken to count 1000 pulses.
^SCCNT: 0000001047
at^sccnt=1,1,2000	Open pulse counter, enable Limit counter mode, request the time
	needed to count 2000 pulses.
OK	"^SCCNT" URC indicates the time taken to count 2000 pulses.
^SCCNT: 0000002040
at^sccnt=1,1,10000	Open pulse counter, enable Limit counter mode, request the time
	needed to count 10000 pulses.
OK	"^SCCNT" URC indicates the time taken to count 10000 pulses.
^SCCNT: 0000010043
at^sccnt=1,1,20000	Open pulse counter, enable Limit counter mode, request the time
	needed to count 20000 pulses.
OK	"^SCCNT" URC indicates the time taken to count 20000 pulses.
^SCCNT: 0000020040

This example shows how to stop the Limit counter mode and close the pulse counter without waiting for the "^SCCNT" URC. Both methods have the same effect, it is up to you which one to use.

at^sccnt=0,0	Stop and close the pulse counter immediately, without "^SCCNT" URC
	being indicated.
OK	Stop and close the pulse counter immediately, without "^SCCNT" URC
at^sscnt=3
	being indicated.
OK

AC75_ATC_V01.002	Page 518 of 569	10/30/06
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