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101

AC75 AT Command Set

20.8 AT^SCCNT

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

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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.

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>.

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.

20.8.1 Using 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.

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.

<mode>

(num)

<limit>

(num)

<time>

(num)

at^sccnt=1,1,1000

Open pulse counter, enable Limit counter mode, request the time

needed to count 1000 pulses.

^SCCNT: 0000001047

"^SCCNT" URC indicates the time taken to count 1000 pulses.

at^sccnt=1,1,2000

Open pulse counter, enable Limit counter mode, request the time

needed to count 2000 pulses.

^SCCNT: 0000002040

"^SCCNT" URC indicates the time taken to count 2000 pulses.

at^sccnt=1,1,10000

Open pulse counter, enable Limit counter mode, request the time

needed to count 10000 pulses.

^SCCNT: 0000010043

"^SCCNT" URC indicates the time taken to count 10000 pulses.

at^sccnt=1,1,20000

Open pulse counter, enable Limit counter mode, request the time

needed to count 20000 pulses.

^SCCNT: 0000020040

"^SCCNT" URC indicates the time taken to count 20000 pulses.

at^sccnt=0,0

Stop and close the pulse counter immediately, without "^SCCNT" URC

being indicated.

at^sscnt=3

Stop and close the pulse counter immediately, without "^SCCNT" URC

being indicated.

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