Svantek SVAN 971 - Function #D - Read; Write Data Files from External Memory (SD-CARD)

SVAN 971 User Manual – Appendixes
106
A.6 FUNCTION #D – READ / WRITE THE DATA FILES FROM THE EXTERNAL MEMORY (SD-CARD)
<disk> logical disk number:
0 – SD-card,
1 – USB Disk (not implemented),
2 – Internal Memory (not implemented)
<address> directory address (cluster numer) – for internal memory 0
<offsetB> offset 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> file name in format XXXXXXXX.YYY (XXXXXXXX – file name, YYY- file name
extension)
<dirName> directory name
<nBwr> number of bytes to write
1) #D,c,?; this function returns the list of available disks in format:
#D,c,<disk1>[,<disk2>[,<disk3>]];
2) #D,d,?; this function returns the 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>; function enables the user to read the file (except of
internal memory):
Response:
#D,r,<disk>,<address>,<offsetB>,<nB>; [<data>]
5) #D,w,<name>,<nBwr>;<data> function enables the user to write the file to working directory:
Response:
#D,w; - command was executed
#D,w,?; - command cannot be executed
6) #D,e,<name>; function enables the user to delete the file in working directory:
Response:
#D,e; - command was executed
#D,e,?; - command cannot be executed
7) #D,e; function enables the user to delete all files in in working directory: