Jiri, you are correct in suggesting he remove the battery to remove the fault but on the 5/02 there is no capacitor to be drained.
Also, removing the battery is just trading one fault for another. Now you have a fault because there is no program loaded. Get the PC talking to the SLC first then worry about the fault.
In regards o the old 6200 series or APS series software, talking to them can be something of a chore. These are DOS programs that were never designed or intended to run in Windows. Back in the old DOS days you could write a program that directly accessed your computers hardware such as a serial port. When you start running Windows on your computer, Windows wants to be the only one talking directly to the serial port. So the programs have to go through Windows to tlk to the serial port. These programs were written BEFORE Windows. They don't know to ask Windows cause there was no Windows when these were written.
If you really want to get your Toshiba to talk to the PLC or SLC using 6200 then call up your local distributor specialist and have them come out and show you how to do it. You really have to know your way around DOS to get things like these to run. Or, just get a machine that isn't running Windows, just good old DOS (did I actually say that?).
OG