On Wednesday, May 13, 1998 12:29, WirtAtmar wrote: > John Zoltak writes: > > > Monitoring for a voltage change on data-out would not work if someone > > moves the console. > > The console messages aren't a necessary condition of the Keep Alive circuit, > merely icing on the cake. A small job sending a message to Port 20's session > every 90 seconds would be all that's necessary, regardless of whether or not > it was the console at the moment. > > I would suggest the message be "Esc A CR LF". This message would cause the > cursor on the terminal to simply recycle in place. > > What would kill the circuit would be if someone should sign on to another > session on the Port 20/console terminal. The Keep Alive job would have to be > restarted with the new session number entered. Alternatively, with 10 minutes > more programming, the program could be made to seek out and find the session > number of the Port 20 device automatically. The only killer would then be that > someone would simply sign the terminal off by doing a ":BYE". But I would > suspect you'd find that out in about two minutes :-). > > Wirt Atmar > > The job sending the messages could check to see if a session for port 20 existed and if not do a STARTSESS. -- Sam Knight Email: [log in to unmask] Senior Programmer/Analyst Phone: (904) 745-7509 Jacksonville University Fax: (904) 745-7149 Jacksonville, FL 32211