I thought that the 'dead' band for 232 was -3V to +3V.
I have used 5V with printers and modems of the 1970s/80s.
Some 'cheap' RS232 drivers only used -5V and Gnd. eg the Microbee
computer.
Over short distances all sorts of liberties can be taken - it works; just
don't call it 232 !
John K
Australia
----- Original Message -----
From: "David Forbes" <dfor...@dakotacom.net>
To: <neonixie-l@googlegroups.com>
Sent: Friday, August 24, 2012 4:57 PM
Subject: Re: [neonixie-l] RS232 line driver
On 8/23/12 11:46 PM, Michel wrote:
I am after a driver like the MAX232 that has 5V levels on one side;
+/- 5 on the other side and only requires a +5V supply. The MAX232
however is a 16 pin device and I am looking for something smaller (8
pins). I only need one Rx and one Tx channel.
I am also thinking, maybe I don't need one and just use 0V and 5V
levels rather than -5V and +5V, but not sure if that will work.
Anybody knows more about that?
Michel
The problem is that an RS-232 driver must make more than 5V to meet the
spec., so it will have four capacitors to make +/-10V from +5V, needing
more than 8 pins.
There is another spec RS-423 which is 5V, but I don't think there are any
drivers for it that run from +5V only. The standard river is the MC3488A,
which requires +/-5V.
--
David Forbes, Tucson AZ
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