Measurement-computing DAQFlex Manuel d'utilisateur télécharger pdf (Page 5)

DAQFlex Message-based Firmware Specification Message-based control transfers

 The DEV component message "DEV:DATATYPE=ENABLED" specifies whether raw data is enabled or

disabled for returned data. When DEV:DATATYPE=ENABLED, the first byte indicates the data type

returned. Refer to the RawData Notes for more information.

 The amount of data transferred must be specified in the wLength field.

Message-based control transfers

Digital I/O Commands

Command

Description

bRequest

Direction

StringMessage

Send string messages to the device

0x80

In/Out

RawData

Return raw data from the device

0x81

StringMessage — SMBI string message

This command reads/writes the string message components of a device. The device stores the various

components and parameters to provide read back.

Output arguments

string

char[64]; 64 character string including a NULL terminator.

Input arguments

None

Input response

string

char[64]; 64 character response string including a NULL terminator.

Notes

 Invalid output strings result in a STALL to the USB Control Transfer, and the input response returns

"INVALID".

RawData — Raw data with SMBI

This command reads the RAW data from the last StringMessage sent to the device. Data is only

returned if the StringMessage has matching RAW data; otherwise a 0 length packet is returned.

Output arguments

N/A – output is not currently supported.

Input arguments

None

Input response

DATATYPE

0x03 – uint8

0x07 – uin16

0x09 – uint32

0x0A – float32

0xFF – Invalid

value

This depends upon the StringMessage sent, but will have the form of

DATATYPE. Invalid StringMessage result in a 0 length packet, or if

DATATYPE is set to ENABLE, one byte reading 0xFF.

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Measurement-computing DAQFlex Manuel d'utilisateur Page 5

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