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
On Aug 24, 3:52 am, Michel mic...@xiac.com wrote:
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.
Actually, the standard specifies an allowable voltage range from +/-
3V to 15V,
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
This one will actually do the trick and is small enough!
Thanks Nigel!
Michel
On Aug 24, 5:50 pm, Nigel Walker dogas...@googlemail.com wrote:
If you don't mind surface mount, a MAX3313e is quite small and will do the
job.
Nigel.
- Original Message -
From: Michel
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.
If half-duplex will work, the DS275
I've seen a lot of projects using pics and PC's, with no interface IC, i
think just some resistors. The PIC has a good output current from the
serial port and most importantly, the later pics have a configureation bit
for the UART to send inverted data.
There's a few suggestions here
A few ideas here too
http://www.scienceprog.com/alternatives-of-max232-in-low-budget-projects/
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That is a neat part, too bad that it is no longer in production. Looks
like Components Direct sells them individually.
http://www.componentsdirect.com/maxim-ds275-pdip-8-package-rs-232-transceiver.html
I'm not sure that I would start a new design for manufacture with them,
though.
-Adam
On
The best way is to use rs232 to uart converter ($3 or so on ebay), You just
plug it into pc and directly connect to rxd and txd of your MCU. This is
cheap and easy solution. The converter itself uses a max232 IC to change
signals from rs232 to TTL.
Dalibor Farný
http://dalibor.farny.cz
sent from
That is interesting, I have to check if my PIC has this inverter bit,
didn't know about that.
I like that 2 transistor solution from the scienceprog website as
well. I actually thought about doing something like that but I wasn't
sure if you can always assume Tx is negative when idle.
My eye
Yes, I'll give it a shot. My PIC indeed has invertable USART ports so
I'm going to hook it up just like that without transistors but just a
few series resistors. The cable is only short. If it doesn't work
(which I doubt), I can always use that $3 ebay interface that Dalibor
was talking about. I
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