RS232 spec is a range of voltage. There is a spec for the max supply volts
and a clarification for the 'logic' level.
eg -16 to -3 is one 'level' and +3 to +16 is the other. [I'll dig out my
copy if needed.]
Many receivers don't implement the dead area and some don't require the
change of polarity, just a change to Gnd.
John K.
----- Original Message -----
From: "Michel" <mic...@xiac.com>
To: "neonixie-l" <neonixie-l@googlegroups.com>
Sent: Friday, August 24, 2012 5:22 PM
Subject: [neonixie-l] Re: RS232 line driver
I just want to establish some serial communication between my computer
and a PIC controller. Like David mentioned, RS232 is actually +/- 10V
rather than +/- 5V. The levels directly from controller are obviously
only 0V and 5V. Now I am thinking, for the Rx input this is not a
problem because it will easily handle the +/- 10V input signals if I
add a series resistor. But the Tx output needs to go from 0V/5V to +/-
10V which is normally done with a MAX232 for example. The MAX has 4
line converters (2 input; 2 output) but I only need 1 for my Tx
signal. So I was after something smaller like an 8 pin or even a 5 pin
driver that works on just a +5V supply.
Michel
On Aug 24, 5:43 pm, Dalibor Farnı <dali...@farny.cz> wrote:
Hello, look on rs485. I played with it a lot, ready to answer Your
questions :-) it works for long distances and allows more devices on one
line (bus).
Try to describe your devices more..
Dalibor Farnıhttp://dalibor.farny.cz
sent from Samsung Galaxy Pad
Dne 24.8.2012 7:46 "Michel" <mic...@xiac.com> napsal(a):
> 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
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