Radyne OM20 Specifications download pdf (Page 45)

OM20 Universal Outdoor Modem OM20 Theory of Operation

MN-OM20– Revision 5 4–7

4.3.1 Terminal Port

This port supports an asynchronous control protocol as described in Section 4. It is configured to

support RS-232 signal levels. This port is intended for use in computer-based remote M&C. All

functions of the modem may be monitored and controlled from this port via a common terminal

connected to the Terminal Port. This function is front panel selectable.

The Terminal Mode Control allows the use of an external terminal or computer to monitor and

control the modem from a full screen interactive presentation operated by the modem itself. No

external software is required other than VT-100 Terminal Emulation Software (e.g. “Procomm”

for a computer when used as a terminal. The Control Port is normally used as an RS–232

Connection to the terminal device. The RS-232 operating parameters can be set using the modem

Front Panel and stored in Non-volatile memory for future use.

Refer to the Remote Protocol Manual (TM117) for the Terminal, Remote and

SNMP screens and protocols.

4.3.2 Modem Remote Communications (RLLP)

The Remote Port located on J20 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 front panel or 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.

4.3.3 Ethernet M&C Port

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. Refer to Appendix E and F for proper setup of the

TCP-IP interface and Web Browser Setup.

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Radyne OM20 Specifications Page 45