Pressure Systems 9022 User Manual
Page 58
Pressure Systems, Inc.
NetScanner™ System (9016, 9021, & 9022) User’s Manual
www.PressureSystems.com
3 - 28
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