Honeywell PPT User Manual page 55

I= Integration Time
The Integration time command allows the user to adjust the analog-to-digital converter integration time
over a range of 1 sample every 12 seconds up to 120 samples per second. The integration time can be
used to filter noisy pressure inputs by averaging, or smoothing, the readings over a selected period of
time. See Figures 4.13 and 4.14.
The integration time can be set within a range of 1 to 120 samples/sec using the I=Rn form or a
range of 100msec to 12 sec/sample using the I=Mn form. The values for 'n' range from 0 to 120 for
the rate (Rn) and millisecond (Mn) form. For I=R0, or
be restored. If there is an input error, then the command error flag in the RS command will be set
and no change will occur.
(Default: I = M2 [200msec = 5 readings/sec])
Inquiry: *ddI=
Action: *ddWE
*ddI= Rn
R n
..............................................................................................................................
M n
I C Idle Count Parameter
The Idle Count parameter specifies the number of pressure integration times that the microproces-
sor skips between output values (see Fig. 4.18). This command is only operational for the I=Mn form
of the Integration Time (I=) command. (See the
parameter can be used to reduce the average PPT power requirement by as much as 50% when
increased response time is acceptable. This parameter is also used to reduce the reply message
traffic on the network bus from PPTs whose response time is not critical. The S2 and
are operational with this parameter to allow integration speed shifting. (Default:
Note: If the OP=W (watchdog timer) command is set, then the IC command will not work (other
than IC=0) and cause a RS command error condition.
Inquiry: *ddIC
Action: *ddWE
*ddIC= ICcount
ICcount
where: 0
1
2
3
255
or Mn
where n = 0 - 120. This form sets the output Rate to integer values between 1 and
120 readings per second. When using the Rn form, the sample rates do not utilize the
S2, S5, and IC commands. I=R0 will restore the last setting saved in EEPROM.
where n = 0 - 120. This form sets the output sample time in 100 Millisecond incre-
ments (0.1 seconds). This allows output rates from 10 readings per second up to 1
reading every 12 seconds. I=M0 will restore the last setting saved in EEPROM.
0 to 255
causes all integration cycles to be used.
causes 1 of 2 integration cycles to be used.
causes 1 of 3 integration cycles to be used.
causes 1 of 4 integration cycles to be used.
causes 1 of 256 integration cycles to be used.
I=M0, the last stored setting in EEPROM will
EEPROM Store: *ddWE
I= command for setting integration times.) This
EEPROM Store: *ddWE
4 9
*dd SP=ALL
S5 parameters
IC=0)
*dd SP=ALL