[TriLUG] C linux programming question

[Jim Ray]

I haven't looked at the EIA-232 spec in over a decade and have only used
the 3 necessary pins for my work: transmit, receive and ground.  You can
touch the oscilloscope probe to the correct pin and capture a trace to
read the ASCII.  The rest of the pins are handshaking thingies.

I reckon TI and Motorola have the functionality for generating the +/-
12 V from 5 V built in to their controllers these days.  Kitchen sink
soon to follow.

> -----Original Message-----
> From: Jeff Jackowski [mailto:jeffj1 at hiwaay.net] 
> Sent: Saturday, May 24, 2003 9:55 PM
> To: trilug at trilug.org
> Subject: RE: [TriLUG] C linux programming question
> 
> and uses a subset of EIA-232-D on that connector. PCs have 
> never, to my knowledge, had a fully EIA-232 compilant 
> interface. That would require a 25-pin connector (only one 
> conductor is unused) and would provide synchornous serial in 
> addition to asynchronous serial.
> 
> BTW: TI makes several chips that are compatible with the MAX232 and 
> similar offerings from Maxim, but are available for less, 
> sometimes 1/3.