Measurement Specialties 9116 - Manual (Page 52)

Pressure Systems, Inc. Model 9116 User’s Manual
Page 43 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 adjustment 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
“appppf”
‘a’ is the command letter
‘pppp’ is the position field
‘f’ is the format field
Response
“ dddd.. dddd”
‘ dddd’ are the data fields, each with leading space (except f = 7 or 8).
Description: The 4-character hex position field (pppp) specifies a 16-bit binary bit-map, with
each bit (set to 1) specifying a particular channel number (16-1, left-to-right).
Only channels 12-1 are allowed for Models 9021 and 9022.
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. Each datum will be
preceded by a space character. 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