
18
Units
Decimal Place
Units
Decimal Place
ATM
4
KGCM
4
BAR
4
KPA
2
CMWC
2
HPA
1
FTWC
2
MMHG
1
INHG
2
MPA
5
INWC
2
MWC
3
MBAR
1
PSI
3
Table 1. Decimal Place Locations for Pressure Readings
(Extended format selected,
OP=E
)
*ddP1 Pressure Value Output during:
TO
Option
Cycle n-1
Cycle n
Cycle 1
Cycle 2
Cycle 3
TO=C
(default)
Vn-2
Vn-1
Vn-1
V1
V2
TO=A
Vn-2
Vn-1
Vn-1
V1
V2
TO=S
Vn-2
Vn-1
<cr>
V1
V2
TO=H
Vn-2
Vn-1
<cr>
V1*
* V1 can be read once anytime after Cycle 1
Figure 9. Synchronize Integration Cycles (SI) Command Example
4.6 Pressure Reading Decimal Position
Digital pressure readings are displayed with a sign and a decimal position. Table 1 shows the number of decimal
place variations among the HPB pressure ranges; the number of digits to the right of the decimal place. This is
important 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 (=0.XXXX). For pressure values,
XX.XX, greater than 1.0, the first character will be a space or a number (= XX.XX or =XX.XX). For example, a 17.6
psia device set to KGCM units (17.6psi x 0.070307= 1.23740 kg/cm
2
) will read the full scale pressure as
#23CP=1.2374
kg/cm
2
. (The numerical limit for FS reading is 90,000.)
Synchronize Integration - SI
I = M4
IC = 0
RR = 0
OP = A
(Multi-Drop only)
Time (sec)
1.0
2.0
3.0
send SI command
(start new I= cycle)
V
n-1
n
n-1
1
2
3
V
1
V
2
V
3
Pressure Value:
Integration (I=) Cycle:
V
n-2
Integration time
HPB pressure output