[TriLUG] C linux programming question

[Jim Ray]

Strictly speaking, PCs implement EIA-232.  RS-232 went bye bye many
moons ago.  Many times, engineers will use something like a little Maxim
IC to generate the +/- 12 V from a 5 V supply.

> -----Original Message-----
> From: Jeff Jackowski [mailto:jeffj1 at hiwaay.net] 
> Sent: Saturday, May 24, 2003 5:55 PM
> To: Triangle Linux Users Goup
> Subject: Re: [TriLUG] C linux programming question
> 
> Actually, PCs implement RS-574, not RS-232. While they are 
> very similar, RS-574 provides a 9-pin connector and defines a 
> signal of 0 volts to be a logic 1. This allows a 
> microcontroller running on 5 volts to send data directly to a 
> PC serial port without any voltage level converter. It works 
> quite well.