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Pressure Systems, Inc. NetScanner™ System (9016, 9021, & 9022) User’s Manual
www.PressureSystems.com
4 - 20
As part of module initialization, all channels are automatically checked for attached PSI 9400
sensors. If a digitally compensated 9400 sensor is attached, its parameters are uploaded to the
module and used for calibrating the sensor. If a non-digitally compensated 9400 sensor is attached
but is equipped with non-volatile memory (EEPROM) and responds properly to the 9021/9022
module query, it’s parameters are uploaded and used for calibrating the sensor. If a 9400 sensor is
not detected, the module will look to see if the module has been configured to utilize the user-
provided parameters out of scanner non-volatile memory. If configured to do so, the module will
use the parameters stored for the channel in scanner non-volatile memory. Otherwise factory
default parameters will be used, resulting in the 9021/9022 modules returning EU (engineering
units) in terms of measured volts.
The following procedures describe methods for storing various parameters into both volatile and
non-volatile memories of 9021/9022 Intelligent Pressure Scanners.
4.7.2 Download calibration parameters into volatile memory
4.7.2.1 For Non-digitally Compensated 9400 Sensors Without Non-volatile
Memory or Non-9400 Sensors
Sensor offset and gain terms are downloaded into volatile memory using
the ‘v’ command with coefficient index numbers 00 and 01 respectively for
the selected channel. c0 through c3 coefficients are downloaded into
volatile memory using the ‘v’ command with coefficient index numbers 02
through 05 respectively.
Front-end gain select is downloaded into volatile memory using the ‘v’
command with coefficient index (cc) 4D. (See NetScanner System
(9016, 9021, & 9022) User’s Manual, Chapter 3, Download Internal
Coefficients (Command ‘v’)). Data for this index selects the front-end gain
for the module as follows: 0=unity, 1=20, 2=45, 3=90. Example: ‘v0014d
2’ sets front-end gain for the first transducer to 45. This parameter can be
retrieved from the module using the ‘u’ command with coefficient index 4D.
4.7.2.2 For Non-digitally Compensated 9400 Sensors With Non-volatile Memory
For non-digitally compensated 9400 sensors with non-volatile memory, the
same commands as for non-9400 “generic” (third party sensors) apply.