Barometer Digital Output Pressure Sensors
16-Mar-03
Asynchronous Command Summary
(1,2)
Command
RD
RM
RO
RP
RR
RS
WD<Mode>
WO<Offset>
U<S/N><Cmd>
Description
Read Mode Setting
Read Model Information
Read User Offset Setting
Read Pressure
Read Device Pressure Range
Read Serial Number
Write Mode Setting (“S” = Standard, “H” = High Resolution)
Write User Offset Setting
Select Unique Part for following command (for multidrop
configurations).
Response
RD=<Mode>
RM=<Model String>
RO=<hhhh>
RP=<hhhh>
RR=<Range String>
RS=<Serial Number String>
WD=<Mode>
WO=<hhhh>
U<S/N><Cmd>
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circuit described herein, neither does it convey any license under its patent rights nor the rights of others.
® MICROWIRE/PLUS IS A REGISTERED TRADEMARK OF NATIONAL SEMICONDUCTOR.
Asynchronous Command Notes
NOTE 1: ALL COMMANDS AND RESPONSES ARE IN ASCII CHARACTER FORMAT AND ARE TERMINATED BY A CARRIAGE RETURN (CARRIAGE RETURNS ARE NOT SHOWN IN
COMMAND
AND RESPONSE TABLE). EXAMPLE: THE READ HIGH RESOLUTION PRESSURE COMMAND (REPRESENTED BY: RH<CR>) IS GIVEN BY THE FOLLOWING
THREE
BYTE SEQUENCE: 0X52 0X48 0X0D
NOTE 2: <hhhh> IS A FOUR BYTE ASCII STRING REPRESENTING A 16-BIT SIGNED VALUE. EXAMPLE: RH=2B7D REPRESENTS THE RESPONSE OF AN RH COMMAND WITH
THE
PRESSURE OUTPUT OF 0X2B7D (11,133 DECIMAL) VALUE.
NOTE 3: <LLLL> IS A FOUR BYTE ASCII STRING REPRESENTING THE LOW RESOLUTION OUTPUT (SIMILAR TO THE HIGH RESOLUTION RESPONSE OF NOTE 2)
NOTE 4: <eeee> IS A 16-BIT ERROR CODE. THE REPRESENTATION IS FOUR BYTE ASCII STRING (EXPRESSING A DOUBLE-BYTE OR 16-BITS). A “NO ERROR” CONDITION IS
EXPRESSED
AS “0000’ WHERE AN ERROR IS EXPRESSED BY SETTING AN INDIVIDUAL BIT OF THE ERROR WORD AND PRESENTING IT IN ASCII HEX FORMAT.
NOTE 5: {NULL} IS A NULL RESPONSE (NO RESPONSE). THE INTENT UTILITY OF THE COMMAND IS TO APPLY THIS COMMAND IN A MULTIDROP CONFIGURATION (BUSSED
CONFIGURATION
) AND SIMULANEOUSLY CAPTURE THE PRESSURE OF ALL OF THE DEVICES ON THE BUSS. THE CAPTURED READINGS CAN SUBSEQUENTLY BE READ USING
THE
U COMMAND (SELECT UNIQUE PART) INCONJUNCTION WITH THE RC COMMAND. EXAMPLE: U<S/N>RC<CR>
