Welch Allyn LC101 CO2 Module - User Manual - Manual (Page 32)

LC101 CO
2
Module OEM Implementation Manual
Page 32 Confidential Welch Allyn OEM Technologies
Calibration Commands
Calibration commands instruct the Module to update the gas calculation or the zero offset
constants used to generate the CO
2
values. At the end of a successful calibration, new constants
are stored in EEPROM memory. Data is required with these commands. There are two types of
calibration: Two-Point User Calibration and Zero Calibration.
Two-Point User Calibration
TheTwo-Point User Calibration updates two of the gas calculation constants used to generate the
CO
2
values. To perform a User Calibration, the host is required to supply a calibration date and a
span gas concentration.
When performing a User Calibration, the LC101 Module must first be in either Unprotected
'Measurement' or 'Autorun' mode. During the calibration, CO
2
waveform and Breath data will still
be sent to the host.
To get an accurate calibration, the LC101 Module needs to be operating for at least 5 minutes in
measurement or autorun modes. The LC101 will not allow a calibration if this requirement has
not been met. In addition, the calibration should be performed at room/ambient temperature.
After a successful calibration, the Module updates the User Calibration History Queues located
in the
C-Cap EEPROM Memory Map.
Host Command Description
<Lmmddyyyy> Update calibration date.
Allows the host to enter a new calibration date from user input into
EEPROM memory.
<Lmmddyyyy> mm = month, dd= day, yyyy= year
Note: The mmddyyyy fields are decimal values.
Example:
<L01012000> calibration date = January 1, 2000
<Gxx> Update span gas concentration.
Allows the host to enter a gas concentration value from user input.
<Gxx> xx = percent CO
2
x 16.
Example:
<GA8> span gas concentration = 10.5%
<C10> Sample zero reference gas.
<C11> Sample span reference gas.
<C13> Abort calibration