Pressure Systems, Inc.

98RK-1 & 9816 User’s Manual©

 

 

READ TRANSDUCER A/D COUNTS (Command 'a')

Purpose: Returns the most recently acquired raw pressure data for the specified channels in averaged signed A/D counts (in the range -32768 to +32767). This simple data bypasses any usage of the transducer’s factory-calculated coefficients or the final calibration process’s correction coefficients (offset and gain). Each datum returned in the response will be in the specified high-precision data format, but representing A/D counts as a signed integer average. (The formula for converting A/D Counts to volts is: Volts = A/D Counts * 5/32768.) This command is intended for advanced users only and is not required for normal operation.

Command

a[p]ppppf

 

 

‘a’ is the command letter

 

‘ [p]pppp’ is the position field

 

f’ is the format field

 

 

Response

dddd[ dddd]...

 

dddd’ are datum fields, each with a leading space (except f =7).

 

 

Description: The 4 or 5 character hex position field ([p]pppp) specifies a 16 or 20 bit binary bit- map, with each bit set to 1 to specify a particular channel number (S & P external rack channels, plus internal channels 16-1, left-to-right).

The 1-character format field (f) specifies the format of each data field (dddd) that will be returned in the requested response. The first datum returned in the response will be for the highest channel number requested. Some formats may not be applicable to the specific type of data being requested. Valid formats are shown in the following table:

f

converts each internal response datum value from..

max.char.

0

single binary float

to

7-10-digit signed decimal “ [-xxx]x.xxxxxx”

13

 

 

 

 

 

1

single binary float

to

8-digit hex integer “ xxxxxxxx”

9

 

 

 

 

 

2

double binary float

to

16-digit hex integer “ xxxxxxxxxxxxxxxx”

17

 

 

 

 

 

5

single binary float

to

long integer (EU*1000) then to 8-digit hex

9

 

 

 

integer

 

7

single binary float

to

single binary float (big endian: msb first)

4

 

 

 

 

 

8

single binary float

to

single binary float (little endian: lsb first)

4

 

 

 

 

 

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Pressure Systems 98RK-1 user manual Read Transducer A/D Counts Command a, Apppppf