First please ensure you have termination resistors on the bus, both modules are powered and the wiring is correct.
If the above is correct, please set GP 76 to 255 on both TMCM-6214 boards and keep the RS485 address (GP 66) as 1 and 2 respectively with the DIP switch. Please also ensure that in the TMCL-IDE connection window, use Search from 1 to 2 and the Reply Address as 255.
This should allow for both boards to be visible in the TMCL-IDE