Article View: sci.electronics
Article #9733Re: RS-232 powered modems
From: Nico Garcia
Date: Fri, 25 Jan 1991 17:37
Date: Fri, 25 Jan 1991 17:37
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>In article <19983@hydra.gatech.EDU> jgb@prism.gatech.EDU (James G. Baker) writes: >>supply. Is there a +5V line on RS-232C and is it standard with DB25 and DB9 >>connectors? Or is there a +12,etc that I could feed into a voltage >regulator? Ummm, I'm looking at a listing of the EIA signals from a Maxwell modem right here. It says pin 9 is +Testing Voltage, Pin 10 is -Testing Voltage. Now, if the *terminal* is wired appropriately, there could indeed be a voltage source there. I've got one of the old phone line modems, though, 1200 baud and almost indestructible. I kinda like it. Runs off the "off-hook" current, which is supposed to be about 10-15 volts across a 600 ohm telephone load. -- Nico Garcia Designs by Geniuses for use by Idiots eplunix!cirl!raoul@eddie.mit.edu
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!watserv1!watmath!att!pacbell.com!ucsd!usc!zaphod.mps.ohio-state.edu!think.com!eplunix!raoul From: raoul@eplunix.UUCP (Nico Garcia) Newsgroups: sci.electronics Subject: Re: RS-232 powered modems Keywords: RS-232, Self-powered Message-ID: <1010@eplunix.UUCP> Date: 25 Jan 91 17:37:27 GMT References: <19983@hydra.gatech.EDU> <2820@casbah.acns.nwu.edu> <2663@krafla.rhi.hi.is> Organization: Eaton-Peabody Lab, Boston, MA Lines: 16