last byte of a data message. This is
optional for PCS 400 messages.
A short sample program in Microsoft QuickBasic,
and a quick reference list of common remote com-
mands are included in the Appendix.
Commands
NOTE: All pressure values will be in the
currently active pressure units unless
otherwise stated.
_PCS4•AUTORANGE•0<lf>
Turns AUTORANGE off. To return to RANGE
HOLD a specific transducer must be assigned
with the following command:
_PCS4•XDUCER•digits.
_PCS4•AUTORANGE•1<lf>
Sets the PCS 400 with multiple internal
transducers to autoselect the transducer with the
highest resolution for the pressure being meas-
ured.
_PCS4•CAL•A/D<•digit>
Internal zero and span calibration of main sensor
A/D converter unless a specific sensor A/D con-
verter is specified by <digit>.
_PCS4•CAL•ATM
Internal calibration of current transducer to the
optional Barometric Reference Transducer (if in-
stalled). Operation vents system to atmospheric
pressure and corrects the zero offset of the cur-
rent transducer.
_PCS4•CAL_DISABLE•OFF
This command cancels the _PCS4•CAL_DIS-
ABLE•ON<•term> command.
_PCS4•CAL_DISABLE•ON
This command prevents any of the following three
commands from executing their respective func-
tions:
_PCS4•CAL•ZERO•n.n
_PCS4•CAL•SPAN•n.n
_PCS4•CAL•ATM•n.n
If any of these commands are sent, the error flag
is set (SRQ is asserted). In this case, the error
response is E63-CAL FUNCTIONS DISABLED.
_PCS4•CAL•SPAN•value
Calibrates the current transducer span by cor-
recting for the difference between the measured
input pressure and the value specified. (Multipli-
cation factor is limited to 0.9 to 1.1. Span correc-
tions are allowed only in the upper half of the
pressure range of the active transducer.)
_PCS4•CAL•ZERO•value
Calibrates the current transducer zero offset by
correcting for the difference between the meas-
ured input pressure and the current units value
specified. (Maximum offset is ±16 psi, or equiva-
lent pressure in the active units.)
_PCS4•CTRL•value
Sets current control pressure to value specified.
Will take effect immediately if in pressure CON-
TROL mode or else stored for future use.
_PCS4•CTRLMAX•value
Sets the maximum control pressure that can be
commanded.
_PCS4•CTRLMIN•value
Sets the minimum control pressure that can be
commanded.
_PCS4•DEFAULT
Sets the unit to the factory default settings (see
table 3.1 in Local Operation).
_PCS4•FILTERSETTING•digits
Sets the percentage of exponential filtering that is
applied when the reading is within the FILTER-
WINDOW using the following equation:
Reading = NR (1 – (digits/100)) + LR (digits/100)
Where: NR = new reading, LR = last reading,
digits = 00 to 99
_PCS4•FILTERWINDOW•value
Sets the maximum value between consecutive
readings that will be filtered. Consecutive read-
ings that differ by more than this value will be
immediately displayed without filtering. Value =
0 to full scale pressure.
_PCS4•FUNC•CTRL<•value•<unitno>>
Set to CONTROL mode at current value unless
value specified, at current units unless unitno
specified. Value must be within minimum and
maximum limits.
_PCS4•FUNC•F1
Set to function F1 if available.
_PCS4•FUNC•F2
Set to function F2 if available.
_PCS4•FUNC•F3
Set to function F3 if available.
_PCS4•FUNC•MEAS<•unitno>
Set to MEASURE mode in current units unless
unitno specified.
PCS 400 REMOTE OPERATION
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