Pressure Systems 9022 - Page 127

Pressure Systems, Inc. NetScanner™ System (9016, 9021, & 9022) User’s Manual
www.PressureSystems.com
4 - 17
A detailed step-by-step procedure follows that includes the specific 9021/9022 commands to be sent
to the module under test.
DESCRIPTION 9021/9022 COMMAND
Set AD averaging to 32 to minimize reading jitter
w1020
Turn off front-end calibration function (9022 ONLY)
w2200 00
Set all channels to gain of 1 (or 20, 45, 90)
1
w1500
(or w1501, w1502, or w1503 for gain of 20,45, or 90)
Read current G=1 reference coefficient from
9021/9022 in ASCII floating point format
2
u01104
(u0118 for 9022 temperature reference coefficient)
Apply 4.500 VDC to 9021/9022 channel 1 **
Read measured voltage from channel 1 in ASCII
floating point (data format 0)
r00010
(t00010 for temperature voltage)
Calculate difference between actual applied voltage
and 9021/9022 reported voltage
**
Download new reference coefficient for G=1 in ASCII
floating point format
3
v01104 x.xxxx (x.xxxx is new coefficient)
(v01118 x.xxxx for 9022 temperature reference
coefficient)
Store coefficient to 9021/9022 FLASH memory
w07
Reboot module to force new coefficients to take effect **
1
The gain control commands for the 9021/9022 are summarized in the following table:
Gain 9021/9022
Command
1
w1500
20
w1501
45
w1502
90
w1503
2
Commands to read the respective gain coefficient commands are summarized in the following
table.