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DMD50 Universal Satellite Modem
4.8
Terminal Screens
For terminal screens, refer to the Remote Protocol Manual.
4.9
RS485 Remote Port Interface (RLLP Protocol)
The Remote Port allows for complete control and monitoring of all parameters and functions via
an RS-232 Serial Interface or RS-485 utilizing RLLP Protocol. 'Equipment Remote Mode' can
be entered from the GUI interface under the "System" menu by selecting "System" and then
"Terminal" followed by "Terminal". The baud rate and evaluation type can be changed at the
front panel by using the System>Baud Rate Menu.
Control and status messages are conveyed between the modem and all subsidiary modems and the
host computer using packetized message blocks in accordance with a proprietary communications
specification. This communication is handled by the Radyne Link Level Protocol (RLLP), which
serves as a protocol 'wrapper' for the RM&C data. Complete information on monitor and control
software is contained in the following sections.
4.9.1 Protocol Structure
The Communications Specification (COMMSPEC) defines the interaction of computer resident
Monitor and Control Software used in satellite earth station equipment such as modems,
redundancy switches, multiplexers, and other ancillary support gear. Communication is bi-
directional, and is normally established on one or more full-duplex 9600-baud multi-drop control
buses that conform to EIA Standard RS-485.
Each piece of earth station equipment on a control bus has a unique physical address, which is
assigned during station setup/configuration or prior to shipment. Valid decimal addresses on one
control bus range from 032 through 255 supporting up to 224 devices per bus. Address 255 of
each control bus is usually reserved for the M&C computer.
MN-DMD50– Revision 3
User Interfaces
4–45
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Troubleshooting
