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PANASTEREO CX230 CINEMA MONITOR
REFERENCE DATA
Serial Interface Protocol Description
The CX230 is equipped with a standard RS232 serial communications port using a 9 pin D-sub
connector. The data format is fixed and is in the following format:
One start bit, eight data bits, one stop bit, no parity, 9600 baud.
Command String Format
"Input select" and "volume set" commands are constructed using a seven character ASCII string.
Commands start with a colon followed by a four character command terminated with a carriage
return, and a line feed character which are also valid if they occur in reverse order. (This is to
allow compatibility with languages that do not provide easy control of the order of these
characters). The "request to send A-D level" command is a single character "ambersand" (&).
When a "Request to send A-D level" command is received the CX230 will respond with a two
character ASCII string starting with a colon followed by an eight bit value.
When the CX230 detects a command start character (a colon), a timer is started and if the rest of
the command including the end characters (CR/LF) is not received within 200mS then the serial
port is ignored until another valid start character is seen. If the command is unknown, then it is
ignored.
The seven characters in the command string each serve the following functions:
The first character is a colon and is the start character
The second to fifth characters represent the function command which is a mnemonic style
command derived from the function to be performed.
The sixth and seventh characters are a carriage return and a line feed character.
Input Select Commands:
MLEF
Select Left Channel HF and LF monitor inputs
MLHF
Select Left Channel HF monitor input
MLLF
Select Left Channel LF monitor input
MCEN
Select Centre Channel HF and LF monitor inputs
MCHF
Select Centre Channel HF monitor input
MCLF
Select Centre Channel LF monitor input
MRIG
Select Right Channel HF and LF monitor inputs
MRHF
Select Right Channel HF monitor input
MRLF
Select Right Channel LF monitor input
MLSU
Select Left Surround Channel monitor input
MCSU
Select Centre (EX) Surround Channel monitor input
MRSU
Select Right Surround Channel monitor input
MSUB
Select Sub-Bass Channel monitor input
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