<td style="vertical-align:middle;">Swapping RS485 A and B lines (or RS232 Tx and Rx) of the external device and also not connecting ground together - May cause irreparable damage.</td> | <td style="vertical-align:middle;">Swapping RS485 A and B lines (or RS232 Tx and Rx) of the external device and also not connecting ground together - May cause irreparable damage.</td> |