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User Interfaces
Directly-Addressed Equipment
Broadcast (all directly-linked devices)
DMD-3000/4000, 4500 or 5000 Mod Section, DMD15
DMD-3000/4000, 4500 or 5000 Demod Section, DMD15
RCU-340 1:1 Switch
RCS-780 1:N Switch
RMUX-340 Cross-Connect Multiplexer
CDS-780 Clock Distribution System
SOM-340 Second Order Multiplexer
DMD-4500/5000 Modulator Section
DMD-4500/5000 Demodulator Section
RCU-5000 M:N Switch
DMD15 Modulator
DMD15 Demodulator
DMD15 Modem
DVB3030 Video Modulator, DM240
Reserved for future equipment types
Note that multi-drop override ID 01 can be used interchangeably to broadcast a message to a
DMD-3000/4000 modem, a DMD-4500/5000, a DMD15 modem, or a DVB3030. Radyne
ComStream, Inc. recommends that the multi-drop override IDs be issued only during system
configuration as a bus test tool by experienced programmers, and that they not be included in run-
time software. It is also advantageous to consider the use of multiple bus systems where warranted
by a moderate to large equipment complement.
Therefore, if a DMD15 Modulator is queried for its equipment type identifier, it will return a "20" and
DMD15 Demodulator will return a "21". A DMD15 Modem will also return an "22". A DVB3030
Video Modulator will return a "23."
4.7.6 Software Compatibility
The COMMSPEC, operating in conjunction within the RLLP shell, provides for full forward and
backward software compatibility independent of the software version in use. New features are
appended to the end of the DATA field without OPCODE changes. Older software simply discards
the data as extraneous information without functional impairment for backward compatibility.
If new device-resident or M&C software receives a message related to an old software
version, new information and processes are not damaged or affected by the omission of data.
The implementation of forward and backward software compatibility often, but not always, requires
the addition of new Opcodes. Each new function requires a new Opcode assignment if forward and
backward compatibility cannot be attained by other means.
4-16
RCS20 M:N Redundancy Switch
Multi-Drop Override ID
00
01
02
03
04
05
06
07
08
09
10
20
21
22
23
24-31
TM056 - Rev. 2.3
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