Wegener DR95 Instruction Manual page 36

output routing, set a temporary receive frequency (an insert), control fading and boost associated
with inserts, abort an insert, modify the search table, set LNB LO frequency, set time-outs on the
various acquisition modes, set the password for modem control, mute/unmute the audio, change
the printer port setup, and set the relays (when available). Reporting commands include reporting
received carrier and audio routing, reporting basic receiver status while tracking or searching,
reporting contents of search table, reporting network-control settings, reporting audio settings
(for inserts), reporting printer port settings, and reporting the (optional) relay status. The help
commands may be used to get a master summary of all other legal commands or get specific
information about individual commands. Refer to appendix B for a description of all terminal
commands.
3.4.2 Remote Modem Control and Reporting
Control and reporting may also be executed via an auto-answer modem. Connect the modem per
instructions given in paragraph 2.3.4, Control/Monitoring Connections. This method of control
and reporting is identical to terminal commands with one exception: Before any commands via
the modem will be accepted, the user must clear password security. After prompting from the
receiver firmware, enter the password and then a carriage return. The normal '>' prompt should
then appear and commands may be issued. If no commands are issued over the course of 10
minutes, then the receiver will presume that the phone link is broken. In this case, password
security will again apply before any more commands will be accepted. Refer to the discussion on
terminal commands in appendix B for any further details on the legal commands using a modem.
3.4.3 Network Control
Network control is implemented using the auxiliary data channel available within the MPEG-
compressed digital audio data. Within that auxiliary data channel, specially formatted command
data packets are transmitted. For a receiver to receive commands from its network, it must be
locked onto and tracking a carrier over which these command packets are transmitted. With one
exception, these packets must have valid network headers matching the pre-set header field (ID)
stored in the receiver's non-volatile memory. If a receiver's "Network Mode" is "shared,"
"shared-mode" network headers will be considered valid even if not matching the receiver's
header ID. If the header is valid, the receiver looks to see if its unique address (serial number ID)
is specified in the packet, and if so, the receiver firmware executes the command. Alternately, the
receiver may have already been pre-assigned to one or more "groups" of receivers. In this case, if
the command packet is addressed to a group in which the receiver is a "member," it also will
execute the command. If not specifically addressed in these ways, the receiver ignores the
commands, though it still remembers receiving its own network's headers. This is important,
because the receiver still knows that it is in contact with its network.
The commands the network may issue the receiver are much the same as those available through
a local terminal. In addition, there are commands to modify group membership, lock/unlock the
receiver (to further network commands), disable/enable local control, set shared/protected
network modes, and cause a receiver reset. Note that most network commands represent
permanent changes to the receiver configuration, that is, the information is stored to non-volatile
memory.
DR95/DR96-001 3-8