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.
| Command | HMI | Board | Syntax | Remark |
| PDI | Send | Receive | @PDI<0000..3600><tagname> | |
| 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 | ||||