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Hi,
Kindly check the following.
1. Have you selected the LLS mode in the RS485/232 settings?
2. Please check the datasheet of the LLS sensor and look for the baudrate setting.
3. Check the sensor datasheet if your connection is correct.
Note:
RS232
RX to TX
TX to RX
RS485
A to A
B to B
4. For your reference: FMC640 RS-232 and RS-485 - Wiki Knowledge Base | Teltonika GPS (teltonika-gps.com)
Best Regards,
Maynard C.