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Pressure Systems, Inc. 98RK-1 & 9816 User’s Manual©
Page 56 www.PressureSystems.com
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
integer
9
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