Please make sure you have the on-board jumpers connected as per the Kit user guide. Please share the image of the jumpers on the board and we can tell you if that needs to be changed.
The old version of Pactron FX3S (Green one) has the TX and RX pins swapped in the RS232 connector. So this must be taken care of.
If it is the new board (Blue one), things will work properly. In that case, please probe the lines to see if you are able to notice any signal. If not, please contact pactron and complain about the issue. You may seek replacement if the board is found to be faulty.
- Madhu Sudhan