RDD100 User Guide
Resp | *99WE | (Command Echo) |
Type | *99du= | |
(A list of available 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 (105 newtons/meter2) |
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/centimeters2 |
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 | 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) |
2.6Changes 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) |
2.7Verifying 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
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.
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