Morningstar RSC-1 Communications Adapter RS-232 to EIA-485 Module (RS-EIA Adapter) By converting to EIA-485, the RSC-1 allows up to 128 Morningstar products to communicate on the same communication bus and over much greater distances. RS-232 ribbon cable (not shown) with low-profile connectors. Status LED for monitoring and diagnostics. RSC-1 Command Adapter.