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RDD100 User Guide 

 

 

 

www.honeywell.com                                                                                                                                                             5

 

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

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. 

 
 

Содержание RDD100

Страница 1: ...Honeywell Pressure Sensor Products RDD100 Remote Digital Display User Manual ...

Страница 2: ...ed Parameters 3 Operation 3 1 Start Up Messages 3 2 Error Indications 3 2 1 Transducer Not Connected 3 2 2 Incorrect Baud Rate 3 2 3 Not Set Up To Continuously Transmit 3 2 4 Wrong Polarity Of DC Power 3 2 5 Transducer Disconnected While Transmitting 3 2 6 Over Under Ranged Transducer Indications 4 Power Requirements 4 1 Voltage 4 2 Current 4 3 Power Connection 5 Operating Environment 5 1 Operatin...

Страница 3: ...dependent upon the pressure display units selected Although many of the supported transducers also have a 0 5V analog output only the digital output is used by the RDD100 as it provides better resolution and accuracy Any of 16 different pressure display units may be selected for use with the RDD100 A list of available pressure units is shown in section 2 4 below A more complete description of the ...

Страница 4: ...te for the transducer is shown below The commands below all use a broadcast address 99 to allow them to operate correctly even if the transducer address has been changed from the factory default setting which is address 01 With the PC and transducer operating at the baud rate found to return a non garbled start up message Type 99we cr Carriage Return Resp 99WE Command Echo Type 99bp n9600 cr Resp ...

Страница 5: ...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...

Страница 6: ... Power The RDD100 is equipped with the reverse polarity protection diodes at its power input The instrument will operate with either polarity 3 2 5 Transducer Disconnected While Transmitting If the transducer is disconnected while transmitting the last reading received will remain on the display and the error LED will light indicating that no further updates are being made Reestablishing connectio...

Страница 7: ...ed 2 Separate cables are available for transducers with Metal or Plastic electrical connectors Standard cable length is 6 feet 1 8 m Connectors may be purchased from Honeywell to construct custom length cables Due to RS 232 limitations recommended maximum length is 50 ft 15 m 3 12 VDC plug is 2 1 x 5 5 x 10 mm I D x O D x length Center pin may be either positive or negative polarity RDD100 Wall mo...

Страница 8: ...RDD100 User Guide 8 www honeywell com Honeywell International 12001 State Highway 55 Plymouth MN 55441 Tel 1 800 323 8295 www honeywellmps com ADS 14124 December 2012 ...

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