Measurement-computing DAQFlex Manual de usuario descargar pdf (Pagina 34)

DAQFlex Message-based Firmware Specification Hardware Reference – USB-1608G Series

 2 analog output channels, numbered 0 to 1 (USB-1608GX-2AO only)

Analog output range is fixed at ±10V.

 1 digital port (8 bits)

Each bit is individually configurable as input or output.

 1 timer output channel

 1 external trigger input

 External pacer input/output

This feature allows multiple devices to acquire synchronized samples.

 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 the input scan rate requested 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 from endpoint 6 IN are used for analog input scans. Bulk transfers to endpoint

2 OUT are used for analog output scans.

o The bulk in and bulk out max packet sizes are 512 bytes when enumerated as a high-speed

device and 64 bytes when enumerated as a full-speed device.

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

o Bulk transactions are complete when a packet is sent that is < the max packet size. When

sending an integer multiplier of the max packet size of data during a transaction, include an

empty packet to indicate the end of the transaction.

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Measurement-computing DAQFlex Manual de usuario Pagina 34