How to coding RS232 (one wire)

NewSpace · Joined: 23 Sep 2003 Posts: 12 Location: South KOREA

Hi?

Thank you for reading.

I wanna control LANC

It's have only one line.... LANC, VCC, GND

I wanna use PIC with CCS-C...

First 4 byte is Send MSG and 4 byte is receive MSG...

But How to connection from LANC to RX / TX

and How to coding

ex>
I wanna send 0x12 0x23 0x 34 0x45 and receive mode A B C D

IF you know please teaching me connection and coding.

thank you~!
_________________
Hello~?

This is South KOREA
My name is Sanghyouk Kim But Call me Nick
Sorry I'm poor English

Ttelmah · Guest

You will need to have a pull up resistor on the line, and use the 'FLOAT_HIGH' keyword, in #use RS232. LANC, is a Sony protocol, using 'control-L' signalling, which is a standard used on quite a few cameras, and is an open-collector drive, which this command emulates. Most cameras contain the required pull-up, but you should verify this, and I would suggest having a largish pull up present at your end of the connection, even if there is a pull up at the other end, since this will prevent the line from floating to an indeterminate state, if the camera is not present.

Best Wishes

dyeatman · Joined: 06 Sep 2003 Posts: 1933 Location: Norman, OK

This link tells you everything you need to know to connect and talk to a LANC device.
http://www3.nbnet.nb.ca/dmeed/sony_lan.html

This link is also helpful:
http://www.boehmel.de/lanc.htm

The first link also gives some C code you can translate to CCS fairly easily but you are going to need to do some work yourself to make this happen.

I also recommend using the ELM interface chip mentioned in this article since it gives you a number of advantages with a very low cost:
http://www.com-n-sense.com/Eng_Article_Lanc.htm
http://www.elmelectronics.com/connect.html