Measurement-computing DAQFlex Bedienungsanleitung PDF herunterladen (Seite 39)

DAQFlex Message-based Firmware Specification Hardware Reference – USB-2408 Series

Hardware features

 16 analog input channels, numbered 0 to 15.

o Analog input mode is configurable for single-ended (16 channels) or differential (8 channels).

o Thermocouple mode requires a differential configuration.

Analog voltage input ranges:

o ±10V

o ±5V

o ±2.5V

o ±1.25V

o ±0.625V

o ±0.3125V

o ±0.15625V

o ±0.078125V

Analog thermocouple input range is fixed at ±0.078125V.

 2 analog output channels, numbered 0 to 1 (USB-2408-2AO only).

 Analog output range is fixed at ±10V

 1 digital input/output port (8 bits).

 1024 bytes of nonvolatile EEPROM memory; used for storing configuration information, calibration

data, and user data.

 RATE takes a float value. An error is generated if value set is less than the device's minimum

sampling rate or greater than the device's maximum sampling rate.

 Calibration operations

o AICAL:LOCK locks the AICAL component from performing calibration operations on the analog

inputs. In order to calibrate the analog inputs, you must first unlock the component using the

AICAL:UNLOCK message.

o AOCAL:LOCK locks the AOCAL component from performing calibration operations on the analog

outputs. In order to calibrate the analog outputs, you must first unlock the component using

the AOCAL:UNLOCK message.

Refer to Analog input calibration messages and Analog output calibration messages for the

calibration messages provided by the firmware.

 Bulk transfers:

o Bulk transfers to endpoint 1 are used for analog input and output scans.

o Analog input scan data is sent through the bulk In endpoint. Analog output scan data is sent

through the bulk Out endpoint.

o The bulk in and bulk out max packet sizes are 64 bytes.

o The bulk transfer size must be a multiple of the USB maximum bulk packet size.

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Measurement-computing DAQFlex Bedienungsanleitung Seite 39