Even digital phone systems pass sound. I'm talking about a speaker and=20 a microphone held up to a telephone handset. 300 baud stuff. Should be=20 plenty. And simple. Customer dials phone. Kerry Charles Craft wrote: > With most companies having digital phone systems now, modems are anything= but simple. :-) > > > > -----Original Message----- > =20 >> From: Kerry Wentworth >> Sent: May 23, 2012 10:34 AM >> To: "Microcontroller discussion list - Public." >> Subject: Re: [EE] Serial over Ethernet options >> >> If you know in advance what needs to be changed, you could simply put a= =20 >> PIC, an EEPROM and a MAX232 in the black box, and have it make the=20 >> changes automatically. If you need to make decisions based on data that= =20 >> is in the machine, you could rig up a simple audio modem and talk to it= =20 >> through any phone. >> >> Kerry >> >> >> Denny Esterline wrote: >> =20 >>> As the title implies, I'm looking for some serial over Ethernet solutio= ns. >>> >>> Skipping some of the messier details, I have a few hundred devices in t= he >>> field that need to have some config options changed. Normally this is d= one >>> via rs232 connection to a PC -it's a little more complicated now that >>> they're in customer hands in 28 different states. So, I can put a tech = to >>> work for the next year and really rack up his frequent flyer miles or I= can >>> find a connectivity solution and do it remotely. >>> >>> What I'd like to be able to do is send the customer a "black box", have >>> them plug it into their network and my device and give me a call. Using= a >>> similar unit at my location, we have serial access to a PC in my office= .. I >>> realize that having that happen seamlessly and without the customer >>> configing it to their network and being able to connect to it from my e= nd >>> without even knowing what subnet it's going to end up on is a tall orde= r... >>> How close can we come? :-) >>> >>> >>> -Denny >>> =20 >>> =20 >> --=20 >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist >> =20 > > > > =20 --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .