MP3Car.com - View Single Post - Renault "Tuner List" Head Unit/CD changer hacking

Vicne · 02-07-2006, 03:43 PM

Quote: Originally Posted by guest

I think that the signal is inverted but ready to connect to rs232 of PC. The idle level output from uart is logical 1 ttl (4-5volt) but when you interface the rs232 the levels are inverted and idle is 0Volt (belove 3v).

Mmmh... Except that logical 1 in RS232 must be a *negative* voltage (between -5 and -15V), so I think the MAX chip is really needed

02-07-2006, 03:43 PM	#12
Vicne Variable Bitrate Join Date: Apr 2005 Location: Belgium Posts: 325	Quote: Originally Posted by guest I think that the signal is inverted but ready to connect to rs232 of PC. The idle level output from uart is logical 1 ttl (4-5volt) but when you interface the rs232 the levels are inverted and idle is 0Volt (belove 3v). Mmmh... Except that logical 1 in RS232 must be a negative voltage (between -5 and -15V), so I think the MAX chip is really needed __________________ Vicne SPDIF CarPC V2 - Tuner List CD Changer Emulator - Chris Conty Last edited by Vicne; 02-07-2006 at 05:23 PM.