I have finally gotten the GC-100 I added to the system working which added RS 232 control.
I have connected a serial cable between the GC-100 and a Marantz 8802. I set the gateway for channel 1 under the RS 232 gateways.
I am using a device I imported called "Marantz AV 8803 Main Zone RS232".
But am unable to control the 8802.
Am I missing something simple with my setup? What can I do to troubleshoot this problem?
1. Make sure that baud rate in GC-100 is set to 9600 from Default 19200. Also, RS232 cable needs to be Straight Through.
2. Why not control it via IP without ANY additional hardware other than it being connected to your home network?