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RDD100 User Guide
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Resp
*99WE
(Command Echo)
Type
*99du= {selection-see DU list below}
(A list of a
vailable pressure display units can also be found in the associated transducer User’s Manual.)
Resp
*99DU= {selected display units} (Command Echo)
Display Units List
Display Unit
PSI Multiplier
Units Description
ATM 0.068046
ambient atmosphere at sea level
BAR
0.068948
bar (10
5
newtons/meter
2
)
CMWC
70.304
centimeters of water column (4ºC)
FTWC
2.3065
feet of water column (4ºC)
INHG
2.0360
inches of mercury (0ºC)
INWC
27.679
inches of water column (4ºC)
KGCM
0.070307
kilograms/centimeters
2
KPA
6.8948
kilopascal
MBAR
68.948
millibar (1 hectopascal)
MMHG
51.714
millimeters of mercury (0ºC) or torr
MPA
0.0068948
megapascal
MWC
0.70304
meters of water column (4ºC)
PSI
1.0000
pounds per square inch
USER
0.0010000-999.99
user supplied
LCOM
FS=60000
logic common value
(1)
PFS
FS=100.000
percent of full scale in 0.001%
Increments
(1)
The LCOM display unit (logic common) automatically switches the digital pressure output to a scale, which has 60000 as the full scale
output. The output will have a decimal point in the same position as it was in the original psi scale. For example, when a 10 psia device is
switched to DU=LCOM, the full scale digital pressure output will be 60.000, instead of 10.000. Also, a 500 psi device will output full scale
600.00 instead of 500.00. PFS generally provides the highest readout resolution available when using the RDD100 readout.
2.5
“Continuous Transmit” Mode
Type
*99we<cr>
Resp
*99WE
(Command Echo)
Type
*99mo=p2<cr>
(Continuous Pressure Transmit Command)
Resp
*99MO=P2
(Command Echo)
2.6
Changes Stored In EEPROM
Type
*99we<cr>
(Write Enable Command)
Resp
*99WE
(Command Echo)
Type
*99sp=all<cr>
(Store Parameters Command)
Resp
*99SP=ALL
(Command Echo)
2.7
Verifying Stored Parameters
After cycling power to the transducer the RDD100 should now display pressure readings in the selected display
units. If there is a need to interrogate the transducer to observe its set-up parameters, this can be done using the
following sequence:
Type
*99du<cr>
Resp
*99DU=INHG
(If transducer is set to read inches of mercury)
Although the Display Units example was used, this method of interrogation will work with any of the set up
parameters, listed above and in the associated User’s Manuals.
Note:
Since pressure units are not a part of the RDD100 display, the user may want to attach a sticker or some other
indication of the pressure units either on or near the display window.