Nmil-7040 Stepper Controller Problem!

[jlattus]

How come when I attached the controller to the stacker on my 68hc11 board the address, corresponding to the jumpers set on the controller, is rom. It changes what ever address is set on the jumpers to rom. I'm unable to write to the address. I think this is why my motors stopped working. How do you make it writable again?

[nmitech]

Try to set the stepper address where there is no memory conflict on the HC11 board, or makesure it is not overlap with your program memory. It can be overlaped with ram memory as long as you don't use that overlaped ram address for data or variable storage. The MEMDIS' signal will disable the shared address memory when you write to the stepper.

[jlattus]

What do you mean by overlapping memory? It used to work before but now all of a sudden it doesn't. Any address I use in ram from 2000-7FFF doesn't work. So why did it work before? I was told by my professor that our board has 32k of ram from 0000 to 7fff but we only use 2000-7fff because of overlapping memory. But he didn't really explain to me what that means.

[nmitech]

It used to work before but now all of a sudden it doesn't.

If you still use the same program and the same hardware setup then something is fried. Could be the stepper or the HC11. You can go through the troubleshouting section of the stepper first make sure all the signals from the HC11 are getting there if not, remove the stepper and go through the troubleshooting section of the HC11 board to find out what component(s) is/are bad.

Or you can email nmiproduction@newmicros.com to obtain an RMA # to send back for repair.