Connecting IMU 6DOF V2 to PCB through TTL com

Hello,

I am currently working on a project that involves using the IMU 6DOF V2 connecting it to a separate PCB via TTL communication from the debug header. However, I am having trouble getting the IMU communicating through our Board. We are using a AVR 1280 uC and sending the data via RS 322 serial to computer.

We have had the IMU send data sometimes, however it stops working after we do something(not sure what exactly, either we flash our PCB with an updated program, or we change the power connections). When it is working, we can reset it and then reset our PCB and it will continue working. When it isn`t working, nothing we do seems to make it work.

It seemed to work more consistently with a lower clock speed set for PCB.

If anyone has any ideas on what might be the problem I`d appreciate it.

Thanks in Advance