Siemens AC75 - Manual (Page 518)

AC75 AT Command Set
20.8 AT^SCCNT
s
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.
OK
^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.
OK
^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.
OK
^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.
OK
^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.
OK
at^sscnt=3
Stop and close the pulse counter immediately, without "
^SCCNT
" URC
being indicated.
OK