Ocean Optics PC2000-PC_104 - Manual (Page 7)

PC2000-PC/104 Data Sheet
External Synchronization (S1:S0 = 1:0)
In this mode, the effective integration time is the time between rising edges of the signal applied to the
External Synchronization pin (J2:Pin 22). This mode is useful for synchronizing the integration time to
an external clock source.
External Hardware Trigger (S1:S0 = 1:1)
In this mode, the PC2000-PC/104 uses an internally generated integration clock that is triggered by the
rising edge of the External Hardware Trigger signal (J2:pin 18). On the rising edge of this signal, the
internal logic resets the CCD array, integrates for 2.1ms and then clocks out the array.
CCD Detector Temperature
Also available is an optional temperature sensor, which when included is located directly under the
detector. The output of this signal is fed to H2: pin 6. The typical error of the sensor is
± o C around
25
o
C. The output is calibrated directly in
o
C with a scale factor of 10 mV/
o
C.
Software Interface
Overview
The PC2000-PC104 employ a memory mapped set of registers, which control all of the functionality.
The register definition is shown in
Table 1. PC2000-PC104 Programming Registers .
Communications with the spectrometer are through a base address, which is defined by switch
settings.
Software Trigger Port (base + 5) Bit Description
Performing an 8-bit read from this port will provide the state of the Software Trigger input on the D3
line (i.e., Read Value & 0x04 to determine Trigger Input line state).
Read Spectral Data (base + 6) Bit Description
Performing a 16-bit read from this port will return one spectral data point. To obtain full spectra
perform 2048 reads after interrupt initiation. Raw data format is signed—invert bit 11 to convert to
unsigned (i.e. Data Value XOR’ed with 0x0800).
Channel Rotation Port (base + 7) Bit Description
Byte wide writes to this port activates or deactivates the rotator. If activated, the value written
determines the number of channels rotated through.
000-00000-000-05-0704 7