Panasonic Projector Serial Port

panasonic projector serial port

A DMX to Serial Converter Use your existing lighting control system to trigger anything with a standard RS-232 port.

panasonic projector serial port panasonic projector serial port
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RC: Serial Control of Panasonic Projector

To try and help you fellows out, What the projector wants is ASCII characters. In front of the ASCII string they want a single ASCII byte as a start of string code, and at the end of the ASCII character string they want a single byte as an end of string code. This is a fairly common protocol.

In the ASCII character set there are no displayable characters with values less than 32 decimal. The character whose decimal value index is 32 hex 20 is the space. For each of the characters below 32 0-31 decimal, 00-1F Hex, commonly called the control characters a Name has been associated with each character. 00 is Nul, 01 is SOH Start of Heading, 02 is STX Start of Text, 03 is ETX End of Text. , 13 is CR carriage return, 10 is LF line feed, When talking transmission protocol it is very common to refer to the control characters by their names making it quite confusing to those not familiar with that convention.

A message may therefor be described as starting with a Start of text STX and ending with an End of text ETX. You then use the capability of the language you are programming in to get the control charachter you need As an example in Visual basic it is common to see:

Const STX as string chr 1

Const ETX as string chr 2

You then can write STX PON ETX.

In the case Sebastian was showing JAVA would have a problem

First of all it needs to understand the types of the right hand sides components and that of the result. The result will be coerced to match the right hand side.

You will need PON to show that component to be a string The quotes.

If you write 02 PON 03 you will get an error as it makes no sense, operators are missing between expressions.

if you try 02 PON 03 the operators are there but it will produce the ascii string 02 PON 03

It is proper to write write String.fromCharCode 1 PON String.fromCharCode 2 which would be correct

If you try 1 PON 2 you get the string 1PON2

If you try 1 PON 2 you get the string 1PON2 since Java Helps you by doing the conversion of integer to string, but you want the control character whose index place in the ASCII table is 1 not the integer 1 whose place index in the ascii table is 49

In Java the best solution is the one shown in the begining by Jlight. It is the notation xNN where NN is the index of the character you want and x means: Escape that is what the really means in a string. The character after the states what to escape to and the x says to a character whose ASCII table index follows as two hex digits. r merely says escape to a carriage retrun and is equivalent to x0D while n says escape to Line feed and is equivalent to x0A. this is done since they are used a lot. There is also a uUUUU for unicode characters.

The escapes must be in a string or else it has another meaning so

x02PON x03 is the really the best shortest JAVA way to write the sequence, but not the most portable to other languages.

What I use is var STX x02 ; var ETX x03 ; so I can write:

STX Message I want to Send ETX

Hope that helps. It always comes up when people not yet familiar with Communications protocol/jargon try and do the right thing reading the manual.

Last edited by Barry Gordon

on October 2, 2007 .

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