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I can't get a response from both LLS sensors that i am trying to configure for the FMC640.

I have already made the connection through RS232 and RS485, and also made the configuration in the I/O section.

Still can't get a response.

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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.