Welch-allyn LC101 CO2 Module - User Manual Manual de usuario descargar pdf (Pagina 33)

LC101 CO

Module OEM Implementation Manual

Section 4 - Host/Module Communications

Welch Allyn OEM Technologies Conﬁdential Page 33

Zero Calibration

The Zero Calibration adjusts the IR source current to compensate for detector output changes.

The host is required to inform the LC101 Module when to start sampling 0% CO

gas.

When performing a Zero Calibration, the LC101 Module must ﬁrst be in either Unprotected

'Measurement' or 'Autorun' mode. During the calibration, CO

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 Zero Calibration, the Module updates the zero residual offset constants

located in the

C-Cap EEPROM Memory Map

Module Responses

The host must initiate all communication with the Module with the exception of periodic CO

waveform and breath data packets. The type of response sent is determined by the type of host

command. Responses include:

• status responses

• mode command responses

• simple command responses

• conﬁguration command responses

• calibration command responses

Host Command Description

<C12> Perform Zero Calibration

<C13> Abort Calibration

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Welch-allyn LC101 CO2 Module - User Manual Manual de usuario Pagina 33