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SV 971A User Manual – Appendixes

150

Note: #9 function is blocked during measurements running state (#1,S1;). Stop the measurements

(#1,S0;) before using the function.

A.1 FUNCTION #D – DATA FILES ACCESS

#D functions are used to access data files in the instrument’s storage like microSD card or USB Flash Disc

with FAT file system. A basic knowledge of FAT file system is necessary to use these functions.

#D functions take the following parameters:

<disk> logical disk number:

0 – SD-card,

1 – USB Disk (not implemented),

2 – Internal Memory (not implemented)

<address> directory address (cluster number),

<offsetB> offset of the first byte to read (an even number),

<nB> number of bytes to read (an even number),

<data> binary data,

<count> directory size in bytes,

<name> filename in the format XXXXXXXX.YYY (XXXXXXXX – filename, YYY- filename

extension),

<dirName> directory name,

<nBwr> number of bytes to write.

1) #D,c,?; this function returns a list of available disks in format:

#D,c,<disk1>[,<disk2>[,<disk3>]];

2) #D,d,?; this function returns parameters of the working directory in format:

#D,d,<disk>,<address>,<count>;

3) #D,d,<disk>,<address>; this function enables to change the working directory.

Response:

#D,d; - command was executed

#D,d,?; - command cannot be executed

4) #D,r,<disk>,<address>,<offsetB>,<nB>; the function enables to read a file from the working directory.

Response:

#D,r,<disk>,<address>,<offsetB>,<nB>;[<data>]

5) #D,w,<name>,<nBwr>;<data> the function enables to write a file to the working directory.

Response:

#D,w; - command was executed

#D,w,?; - command cannot be executed

6) #D,e,<name>; function enables to delete a file in working directory.

Svantek SV 971A User Manual

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