Instruction manual

Page 33
Page 33 of 74 UTY4422-001
Table 15. Audio Handling
Stereo Original encoder L and R routed to corresponding L and R outputs on IRD
Reverse Stereo Original encoder L routes to IRD R output, while original R routes to the L
output
1 on both Original encoder L is routed to both L and R outputs on IRD
2 on both Original encoder R is routed to both L and R outputs on IRD
3.6 SOURCES OF CONTROL
The IRD can be controlled via COMPEL™, terminal, modem, and Display / push buttons. Each
of these methods of control is explained in the following sections, but you should see the
COMPEL manual for a complete explanation of the COMPEL system.
3.6.1 COMPEL™
The COMPEL command stream from the uplink is usually the unit’s primary source of control.
This asynchronous stream is mux’ed into the aggregate MPEG data stream at the uplink.
3.6.2 Terminal
You may access the terminal command interface by setting Serial Port 1 or Serial Port 2
“device” to “Terminal” (using front panel control, if enabled by your Network Control).
Terminal default settings are 19200, N, 8, 1. You may then access the terminal commands if you
have a terminal installed. These commands appear on a help screen and are documented in
Appendix A of this manual. With the exception of the “R” and “H” commands, they are only
available if local control is enabled.
3.6.3 Modem
The modem command interface is similar to the terminal interface. That is, it does not use
special handshaking or special control characters for this interface, and only supports auto-
answer modems. In fact, the IRD does not distinguish between an attached terminal and a
modem. To access the modem command interface, the serial port 2 “device” must be set to
“Modem” (using front panel control). To access user commands, the user must enter the correct
password at the prompt. The user then retains access until the “OH” command is received, or
two 10-minute periods pass with no user input. As is the case for the terminal, the user
commands are restricted when local control is disabled.
3.6.4 PAL / NTSC Selection
The UNITY4422 accepts both PAL and NTSC video. Whether the input is PAL or NTSC is
auto-detected, and the appropriate parameters are set under software control.