cctalk Digest, Vol 70, Issue 3

[Ethan Dicks]

On Wed, Jun 3, 2009 at 11:37 AM, Dave McGuire <mcguire at neurotica.com> wrote:
> On Jun 3, 2009, at 12:06 AM, Jay West wrote:
>>
>> These devices had a lot of trouble with RS423, where the voltage was much
>> less than RS232. I don't recall the exact numbers but RS232 was something
>> about 12V swings
>
>  +/- 15V

Formally, yes, that's the max signalling voltage, but in practice,
there's a lot of 1488/1489 circuits powered by 7812s and 7912s out
there.  I am pretty sure that the MAX232 can't get things better than
about +/-10V (but I could be mistaken about that).

-ethan