Ocean Optics NeoFox Engineering Note - Manual (Page 29)

NeoFox Communication Interfaces
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Data Copy Parameters
Uart Data Copy Mode Unsigned char 0,1 88
Determines whether new samples should be copied to the Uart automatically or whether the device should wait for
a request from the host before copying the next sample. When the value of this parameter is 0, the device will be in
Auto mode and samples will be copied automatically. When the value of this parameter is 1, the device will be in
request mode, meaning that samples will only be copied when requested by the host.
Uart Data Copy Trigger Unsigned char 0,1 84
When the value of the Data Copy Mode parameter is 1 (Request Mode), and the value of this parameter is 1, the
next sample available will be copied to the transmission buffer and sent through the Uart. This parameter will
immediately be reset to 0.
Uart Data Copy Type Unsigned char 1,2,3 87
Specifies the format of the data structure that is copied into the transmission buffer for transmission to the host
through the UART.
Single Point Reset Parameters
A single point reset works as follows:
1. The user puts the temperature sensor and oxygen sensor into an environment with a known oxygen
partial pressure.
2. The user waits for the measurements to stabilize (the longer, the better).
3. The three measurement conditions are written to the device:
• Single Point Tau – the current value of Tau that is read by the sensor in the SPR
environment.
• Single Point Temperature – the current value of temperature that is read by the sensor in the
SPR environment.
• Single Point Oxygen – The known partial pressure of oxygen (expressed as percent of 1
ATM) in the SPR environment. In ambient air, at sea level, this is 20.9%.
4. The Single Point Calculate command is issued to the device. This instructs the device to perform the
single point reset, which recalculates the single point coefficients from the original multipoint
coefficients and puts the device into single point calibration mode.
5. (Optional) Some users may want to issue a flash write command as well, in order to save the new SPR
coefficients to memory.