Honeywell PPT, User Manual

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Synchronize Integration - SI
(RS-485 only)
I = M4
S2 = 0
Pressure Value:
Integration (I=) Cycle:
V
n-2
1.
0
n-1
V
n-1
n 1
V
1
2.
0
2
V
2
3
V
3
3.
0
S5 = 0
I C = 0
RR = 0
OP = A
Time (sec)
send SI command
(start new I= cycle)
Integration time
PPT pressure output
*ddP1 Pressure Value Output during:
TO Option Cycle n-1 Cycle n Cycle 1 Cycle 2 Cycle 3
TO=C (default)
TO=A
TO=S
TO=H
Vn-2
Vn-2
Vn-2
Vn-2 Vn-1
Vn-1
Vn-1
Vn-1 Vn-1
Vn-1
<cr>
<cr>
V1
V1
V1
V1*
V2
V2
V2
* V1 can be read once anytime after Cycle 1
Figure 4.19—Synchronize Integration Cycles (SI) Command Example
4.10 PRESSURE READING DECIMAL POSITION
Digital pressure readings are displayed with a sign and a decimal position. Table 4.2 shows the
number of decimal place variations among the PPT pressure ranges; the number of digits to the right
of the decimal place. This is valuable when converting a binary format number so that decimal
position can be determined. For pressure values less than 1.0, (.XXXX), the first character of the
pressure reading will be a zero if positive (=0.XXXX), or a minus sign if negative (=-.XXXX). For pressure
values, XX.XX, greater than 1.0, the first character will be a space or a number if positive (= XX.XX or
=XX.XX), or a minus sign if negative (=-XX.XX). For example, a 20psig device set to KGCM units (20psi
x 0.070307= 1.40614 kg/cm
2
) will read the full scale pressure as “ #23CP=1.4061 ” kg/cm
2
. (The numerical
limit for FS reading is 90,000.)
Units 1 psi 20 psi 100 psi 500 psi
ATM 6 .................. 4 ................. 4 ................ 3
BAR 6 .................. 4 ................. 4 ................ 3
CMWC 3 .................. 2 ................. 1 ................ 0
FTWC 4 .................. 2 ................. 2 ................ 1
INHG 4 .................. 2 ................. 2 ................ 1
INWC 3 .................. 2 ................. 1 ................ 0
KGCM 6 .................. 4 ................. 4 ................ 3
KPA 4 .................. 2 ................. 2 ................ 1
MBAR 3 .................. 1 ................. 1 ................ 0
MMHG 3 .................. 1 ................. 1 ................ 0
MPA 7 .................. 5 ................. 5 ................ 4
MWC 5 .................. 3 ................. 3 ................ 2
PSI 4 .................. 3 ................. 2 ................ 2
Table 4.2—Decimal Place Locations for Pressure Readings
(Extended format selected, OP=E )
2 4