Article View: sci.electronics
Article #9473RS-232 powered modems
From: James G. Baker
Date: Sun, 20 Jan 1991 22:55
Date: Sun, 20 Jan 1991 22:55
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1084 bytes
I've seen small 2400 baud modems that *only* have COM and phone connections.
How do these pull power from the telephone or computer? I need to make a
box with similar needs (a few LS parts) and of course they need a +5 power
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?
Thanks!
--
BAKER,JAMES G - Undergraduate Lab Instructor, School of Electrical Engineering
____ _ _ Georgia Institute of Technology, Atlanta Georgia, 30332
| | _ |_) uucp: ...!{decvax,hplabs,ncar,purdue,rutgers}!gatech!prism!jgb
(_|. |_). |_). Internet: jgb@prism.gatech.edu
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!uunet!samsung!emory!gatech!prism!jgb From: jgb@prism.gatech.EDU (James G. Baker) Newsgroups: sci.electronics,comp.sys.ibm.pc.hardware Subject: RS-232 powered modems Message-ID: <19983@hydra.gatech.EDU> Date: 20 Jan 91 22:55:56 GMT Followup-To: sci.electronics Organization: Georgia Institute of Technology Lines: 14