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Unity 4600 User's Manual
Device
Terminal I/O - The Terminal device is used for command and control of the
handling
U4600. This I/O is a basic VT100-like emulation. All I/O is prompted by user-
input text strings terminated in carriage-returns. The terminal, whether local or
(via modem) remote, should be set to local echo ON. The unit only echoes a
carriage-return/linefeed and then a '>' prompt after user entry.
Modem I/O - The Modem device operates in a similar manner to the Terminal
device. Whereas the Terminal device was limited to a specific configuration,
the modem device may be set to one of several. The Modem device does not
use special handshaking or special control characters, and only supports auto-
answer modems. To access the modem command interface, the serial-port
device must first be set to Modem. The "Terminal/IO" discussion above on
emulation and echoing would then apply. The user would send the unit a car-
riage return and then the unit would return a prompt to enter the "modem pass-
word". If the correct password is entered, then modem access is enabled. Upon
enabling modem access, the U4600 will output a welcome banner. After that,
I/O is indistinguishable from normal terminal access, with the same restriction
on local user access as set by the Network. Modem access is disabled when
either (1) a new input serial-port device is selected, (2) when there is no user
input for 10 minutes, (3) the OH command is received, or (4) the unit is reset.
Aux Data - The Aux Data device is defined to allow for async data streams to
be carried within the transport stream and their raw payload output on an IRD
serial port. The PID of these streams may or may not be assigned to a program
number within a PMT. To recover the data, the IRD need only be given the PID
and baud rate. The range of legal PIDs is established by the ISO 13818 stan-
dard as 20 to 1ffe (hex). This may be performed either by COMPEL
mand or by the local user (if local control is enabled).
COMPEL
stream (for testing only). There is no output.
PRINTER OUTPUT - This is an output-only device. For the Printer device,
there are three legal types: COMPEL-requested Reports, COMPEL E-mail,
and Raw COMPEL (binary) Data. The first output type are IRD status reports
identical to those that the local user may request. These are always available
for the Printer device. The second output type must be enabled by a non-vola-
tile control. The last type, Raw COMPEL, must also be enabled by a non-vola-
tile control (actually a factory setting that can only be modified with debug
access). It is exclusive of the other outputs (the others are not allowed if dump-
ing Raw COMPEL). For this type, the COMPEL data stream, while being pro-
cessed normally by the IRD host processor, is also output as-is to the Printer
device. This data is binary and includes non-printing characters.
800032-01 Rev. C
- This device is defined to allow for input of the COMPEL control
32
com-
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