G201 Improvements

Hi,

I am doing a major revision of the G201. The improvements, among
others, are having standby current reduction and changing the STEP
and DIRECTION interface to where it can be common +5VDC (as now) or
common ground (which everyone seems to want).

Standby current will reduce to 33% of nominal 1 second after the
issuance of the last step. It will build up to 100% of nominal
milliseconds after the issue of a new step.

The interface will change from a 3 terminal one to 4 terminals. The
STEP and DIRECTION input opto-isolators will have two independent
terminals each so they can be operated common ground or common +5VDC.

The DISABLE function will move to the current set input. Shorting the
current set resistor will now disable the drive.

Any comments or objections to this change will be appreciated.
Otherwise I will be letting the new circuit layout for fabrication
next week.

The 160VDC versions of the G201 and the G320 are moving along. When
they are near being finished, I will post something about them.

Mariss