KMPS-1-64 Manual
12/18
KM 8000 Rev. A
Page 23 of 40
Copyright © 2018 Kulite Semiconductor Products, Inc.
All Rights Reserved.
4
– Every 5 Minutes
5
– Every 10 Minutes
6
– Every Second
7
– Every sample (this will drastically reduce sampling rate)
4.8
Default Mode
If Multiplex Pin 6 is held low when the KMPS is started or reset it will enter default mode. In
this mode the address is always set to 00 and the baud rate is 9600 for RS-485 scanners. For
Ethernet scanners it will default to DHCP mode with a port number of 18008. It also defaults
to the lowest scan rate available with streaming turned off. This is useful if a parameter was
set incorrectly and communication is no longer possible. It is important that in normal use the
Multiplex Pin 6 is not held low during startup. The trigger pin can also not be held low during
startup as the scanner then enters a factory programming mode used for updating the
firmware.
4.9
User Data Storage
There is a limited amount of space in which users can store data both in the main scanner
EEPROM and in each module’s EEPROM. Data is stored in the main KMPS memory using
the EEprom command. Data is stored two bytes at a time in hexadecimal format. There is
0x1000h space available for user data. Each module has a built in command for storing the
calibration date and calibration due date using the Date command followed by either
CAlibration or DUe. Dates are entered in the MM/DD/YYYY format. There are also 4 strings
of 28 characters each where users can enter zany other information using the USer command
followed by the string number (0-3) and the string they wish to save. For example USer 0
CAL -
65 to 255F will store the string “CAL -65 to 255F”.
4.10
Calibration
While all temperature compensation is done at the factory the user does have the ability to
adjust the gain and offset of each channel to correct for small drifts over times. This is done
using the OFfset and SLope commands. Each channel starts with a user offset of 0 and a
user slope of 1. See
for detailed instructions on calculating correction coefficients.
4.10.1 Auto-Zero
The SOI piezoresistive sensors used on the KMPS are extremely stable and have very low
drift rates over time. However, after a long period of use or after the KMPS has seen extremes
of temperature or pressure the offset may drift out of specification. The KMPS has the ability
to automatically adjust the User Zero for differential sensors to correct for any offset drift with
time. When there is known to be zero differential pressure between the front and reference
port of all the active sensors the user can issue a ZEro command. The KMPS will then take
a reading of all the active channels and adjust the User Zero to make the output exactly 0. It
is important to make sure there is no applied pressure at the time of a zero command. The
user can manually reset the offset using the OFfset command if a channel was incorrectly
zeroed.
5 Maintenance
The KMPS has been designed with several user serviceable parts. Proper maintenance will
allow the KMPS to function for long periods of time. The four modules are designed for easy
removal and replacement allowing for customization for different tests environments.
Summary of Contents for KMPS-1-64 Series
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