Hi, > I have a CPU Controller card (8085 based, vintage �1987). The motor blew on > the machine, power surges came and went, and now it won't communicate with the outside world.
I think you have had some major currents flowing through ground and electronics. Note: if you connect a PC that is grounded with a machine, you have made a very large loop that will pickup magnetic fields, and induce currents in the ground. This can destroy everything. ALWAYS use optical isolation in industrial environments. One chip is totally (I mean tetotally) > destroyed, right beside the serial port. The com port on the relevant pc > has also been blown, beacuse it was connected at the time. You must have had large currents. Good serial ports can handle some light abuse. So before using your machine again after repairing (using info of other emails), I would suggest optical isolation. Or place the PC close to the machine, and connect it to the machine's power. In machines we made, we often used "opto-link", a plastic fibre cable, with some connectors and adapters, reasonably cheap and very reliable. The opto-coupler with the highest max voltage available! The only minus is that I hate adaptors (just look behind my PC, and you'll know why, adapters for: scanner, USBhub, router, palm, isdn-modem, HP jetdirect, fotocamera, batterycharger, bankcard reader, USB harddisk, videocamera, digital microscope, "normal" phone charger, GSM charger, eprom-eraser, programmer). The easiest way to optically isolate machines is by current loop, or by opto-couplers in the RS2323 signal path. Email me if you want some info or schematics. I made this before. Regards, Pieter Hoeben ______________________________________________ Hoeben Electronics Phone: +31 6 51590081 Ronkert 44 Fax: +31 13 5096025 5094 EW Lage Mierde Private: +31 13 5096200 The Netherlands E-mail: [EMAIL PROTECTED] http://www.hoeben.com ______________________________________________ -- Author: Pieter Hoeben INET: [EMAIL PROTECTED] Fat City Hosting, San Diego, California -- http://www.fatcity.com --------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB CHIPDIR-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
