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HD9084 HDTV Caption Encoder Manual
SERIAL CONTROL PROTOCOL Page 4-5
Designator Name Values Description
ws
Word size
7 7 bit data word
8 8 bit data word
par
Parity
O Odd parity
E Even parity
N No parity
tz Time zone
0:00 to 23:59 Time zone hours and minutes relative to UTC
ovr Override O Forces override
4.2.3. Flow Control Handshaking
When the encoder’s input buffer is nearly full the device sends an XOFF for each character received. If
the Caption software continues to send data and the input buffer fills completely, the caption encoder
will show the message BUFFER OVERFLOW on the front panel display. When the input buffer has
overflowed some data may be lost. When the input buffer is nearly empty the caption encoder will
transmit an XON character. The HD9084 uses hardware flow control to prevent lost data. The unit will
turn off the RS232 RTS signal when the buffer is nearly full, and will turn RTS on when the input buffer
is nearly empty.
4.2.4. Break Handling
A break character can be sent to the caption encoder to cause the content of the associated input
buffer to be discarded. If the break character is sent to a modem port (Modem D or Modem E) the
modem character buffers will also be discarded. This allows the user to circumvent a backlog of data
input, and regain immediate control of the encoder. The best way to reset a communications port is to
send a break followed by a Control-F – Control-F command.
4.2.5. Command Responses
When the HD9084 accepts any of the Control-A commands it will respond by sending back an asterisk
‘*’ prompt with the following exceptions:
When in real time mode it will respond with a colon ‘:’ prompt.
When an article is being defined it will respond with a ‘>‘.
4.3. COMMON COMMANDS
4.3.1. Set Baud Rate
The caption encoder’s serial remote control ports may be set to operate at any standard baud rate from
1200 to 57600. When this command is executed the new baud rate will become immediately active,
and the sending computer must immediately switch to the new rate. The new baud rate is stored in
non-volatile memory and will be restored when the unit is powered up.
The modem ports may have a lower maximum baud rate that is related to the maximum baud rate of
the built-in modems. The baud rate for the modem ports will also limit the maximum connection rate
that the modems will allow.
USO
RESTRITO