| <-prev [Thread] next-> | <-prev [Date] next-> | 
|
| Month Index | List Home | ||
|
Subject: Re: [stella] compact send-only serial subroutine From: "Fred Quimby" <c9r@xxxxxxxxxxx> Date: Sat, 13 Aug 2005 04:42:15 -0400 |
I forgot that you should have a diode too so that the -12v doesn't make it
through. This circuit should output about +3v for +12v and 0v for -12v.
Should produce valid TTL levels for serial ports that output +9v and up. If
your serial port outputs less than 9v, reduce the size of the 3k resistor
accordingly.
3k
2600 Pin 2 ----/\/\/\/\------|<---- TxD (pin 3 on PC)
|
\
/
\ 1k
/
|
GND
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://stella.biglist.com
| Current Thread |
|---|
|
| <- Previous | Index | Next -> |
|---|---|---|
| Re: [stella] compact send-only seri, Fred Quimby | Thread | Re: [stella] compact send-only seri, Glenn Saunders |
| Re: [stella] compact send-only seri, Fred Quimby | Date | Re: [stella] Announcing "webTune260, B. Watson |
| Month |