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Article #18555How to connect grounds when using RJ11 for RS232
From: Mark D. Freeman
Date: Sun, 14 Feb 1988 06:03
Date: Sun, 14 Feb 1988 06:03
28 lines
1571 bytes
1571 bytes
Yes, I know how stupid this question is. We are starting to use multiport boards in our multi-user microcomputer systems. The boards have 8 6-wire modular phone-type jacks on them. We are running cable through the walls which has 2 twisted pairs and a shield. At the terminal end, we attach a male RJ11 to the wire coming from the comuter, and plug it into the terminal through an RJ11->DB25 adapter. Most of the time, we only need Send Data and Receive Data connected, as we are using XON/XOFF handshaking. The rest of the time, we need to add Clear-to-send. So that takes care of two or three wires. RS232 provides for a pin 1 ground and a pin 7 ground. The cable's shield ought to be connected to something, but all the connectors are plastic. The question, what do I connect the cable's shield to? If I can only connect one ground, which should I hook up? If I can hook up both, should I bother? -- Mark D. Freeman (614) 262-1418 mdf@tut.cis.ohio-state.edu 2440 Medary Avenue ...!cbosgd!osu-cis!tut.cis.ohio-state.edu!mdf Columbus, OH 43202-3014 Guest account at The Ohio State University
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!water!watmath!clyde!rutgers!husc6!hao!oddjob!gargoyle!ihnp4!cbosgd!osu-cis!tut!mdf From: mdf@tut.cis.ohio-state.edu (Mark D. Freeman) Newsgroups: sci.electronics Subject: How to connect grounds when using RJ11 for RS232 Message-ID: <6561@tut.cis.ohio-state.edu> Date: 14 Feb 88 06:03:50 GMT Organization: StrongPoint Systems, Inc.; Columbus, OH. (guest of Ohio State U.) Lines: 28