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
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Re: [stella] compact send-only seri, Fred Quimby | Thread | Re: [stella] compact send-only seri, Glenn Saunders |
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