Make sure the Omni Stat address is set to 1 and and the M1XSP running Firmware 7.x.x is set to address 1 as well. There should be two location within the Omni programming to set the Baud Rate make sure both are set the same. You can try 2400 Baud Rate to start with but may need to lower to 300 (make sure Omni and the M1XSP are set to the same baud rate)