With PDI a command for polling digital information is given to the board. The PDI is valid for digital input and output pins. The frequency for polling has to be between 0 and 3600 seconds. 

PDI Send@PDI,<1|0>,<tagname>Polled data message
Possible error messages coming from the board
%FAT-UNKCMD-BTSERIAL, Unknown command received
%PDI-UNKCMD-BTSERIAL, %PDI-UNKCMD-BTSERIAL, poll freq not between 0..3600
%PDI-UNKCMD-BTSERIAL, Unknown tagname received