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OM20 Universal Outdoor Modem
to be modified and pressing the terminal key of the option number. For example, to change the
transmit data rate, enter '33' at the terminal. The modem will respond by presenting the options
available and requesting input. Two types of input may be requested. If the input is multiple
choice, the desired choice is selected by pressing the 'Space' key. When the desired option is
displayed, press the 'Enter' key to select that option. The other possible input type requires a
numerical input (such as entering a frequency or data rate. This type of input is followed by
pressing the 'Enter' or carriage return key. An input can be aborted at any time by pressing the
'ESC' key. Invalid input keys cause an error message to be displayed on the terminal.
The Terminal Control Mode supports serial baud rates of 150, 300, 1200, 2400, 4800, 9600,
19200, and 38400. The connection must be set for 8 data bits, 1 stop bit and no parity (8,N,1).
Three terminal emulations are supported: VT-100, WYSE 50, and ADDS-VP.
"$" is used for setting the screen when the terminal is used for the first time the non-volatile
memory is reset.
6.5
Modem Remote Communications
6.5.1 Host Computer Remote Communications
The Remote Port (J2) of the OM20 allows for complete control and monitoring of all OM20
parameters and functions via an RS-232 Serial Interface, or RS-485 for RLLP Protocol. 'Terminal
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 OM20 and the 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.
For RLLP command structure and the SNMP MIB, reference the "Remote
Protocol for the DMD20/DMD50/DMD2050/OM20" manual (TM-117).
TM116 – Rev. 1.2
Web Browser/Remote Protocol
6-64
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