Comtech EF Data DMD1050 - Manual (Page 34)

DMD1050 Satellite Modem Board Theory of Operation
MN-DMD1050 3–8
Revision 9
1 stop bit
3.3.6 Terminal Screens
3.4 Modem Remote Communications (RLLP)
The Remote Port located on J1 allows for control and monitoring of parameters and functions via
an RS-232 Serial Interface, or RS-485 for RLLP Protocol. ‘Equipment Remote Mode’ setup can
be entered from the Web Browser interface under the “System” menu. This requires the user to
first set the Remote Port Control to “Remote” then set the Multidrop Address as needed followed
by setting the Remote Interface to RS232 or RS485.
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.
3.4.1 RLLP 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 for a total of up to 224 devices per bus. Address 255 of
each control bus is usually reserved for the M&C computer.
3.5 Modem Setup for Ethernet M&C (J10)
This port is dedicated for Ethernet Communications supporting SNMP, FTP and Web Browser.
The port is configured for 10 Base-T communications protocols. The Ethernet M&C Interface
requires a standard RJ45 Male connector. The Ethernet Interface is shipped from the factory in
an addressable “BOOT MODE” state that allows the user to access the unit. This “BOOT
MODE” state is set to “IP TEST”.
Refer to the Remote Protocol Manual (TM117) for the terminal screens.
Refer to the Remote Protocol Manual (TM117) for the RLLP Protocol.
IMPORTANT
IMPORTANT