GDC to JNIOR Connection Not Working

If the JNIOR series 4, models 410, 412 or 414, is not working with the GDC Cinema Server then check to make sure MODBUS is enabled. The built-in library for the JNIOR on the GDC servers uses MODBUS. MODBUS communicates on port 502.

While the series 3 JNIORs have the MODBUS server enabled by default, for Series 4 JNIORs the MODBUS server is an optional application that needs to be enabled. Here is how to Enable the Modbus Server