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Vidikron Vision Model 120 Owner’s Operating Manual 67
PRE
L
IMINAR
Y
6.1
RS-232 Connection and
Port Configuration
To interface the VHD Controller with a home theater automation/control system or a PC
running terminal emulation software, connect it to your control system or PC as shown in
Figure 3-16. Use a null-modem cable.
If you are using a PC to communicate with the VHD Controller:
1. Start a terminal session on your PC using a terminal-emulation program, such as
HyperTerminal.
2. Configure the PC serial port as follows: no parity, 8 data bits, 1 stop bit and no flow
control. Set the baud rate to 19200, to match that of the VHD Controller RS-232 port.
3. Press <Enter>. You should see a command prompt (>) in the terminal window.
4. Type a command from among those listed in Table 6-1 and press <Enter>.
6.2
Serial Command Syntax
• Commands are in ASCII format and are not case-sensitive; on and ON are equivalent.
• For a command that takes no parameters, type the command followed by a carriage
return; for example, to turn on the system, type ON<Enter>.
• For a command that takes a parameter, type the command, one or more spaces and the
desired value followed by a carriage return; for example, to switch to the S-Video input,
type SSRC
1<Enter>.
• When you enter a valid command, the VHD Controller executes it. When you send an
on/off, input selection, aspect ratio or image preset command, the VHD Controller also
responds with an acknowledgment on the command line. For example, when you issue
the command SAR
2, the VHD Controller responds with Letterbox on the command
line.
• When you enter a misspelled or otherwise invalid command, the VHD Controller ignores it
and responds with Invalid Command on the command line.
• When you send a command followed by values outside the valid range for that command,
the VHD Controller ignores it and responds with Invalid Parameter on the
command line.
• When the VHD Controller receives an OFF command, it will not acknowledge or execute
any commands for approximately 90 seconds afterwards. This is to prevent hot re-strikes
of the lamp, which can damage it.
6Serial Communications