IHSS57-36 with 7i92 don't move

PCW wrote:

Note that I do not recommend connecting motor drives directly
tp the 7I92 but it can be done if you are careful no only connect
the 7I92 IO pins to OPTO isolated signals

well it seems i had to learn it the hard way - after accidently wiring the motor-plug from the wrong side and using it that way it seems like the pins on the mesa went belly up - i'm measuring constant 5V on the pairs which should output step/dir as soon as i start linuxcnc. am i right assuming these pins are unrecoverably busted?

since there's P1 which is currently unconfigured with the default bit-file (and assuming it has the same capabilities like P2) i would be thankful for pointers how to get P1 configured.

lesson learned: found and ordered a cheap breakoutboard with optocouplers (for further use with the 92) and got a 7i96 on the way (which takes a bit longer).

thanks,
markus.

markusk wrote:

i'm measuring constant 5V on the pairs which should output step/dir as soon as i start linuxcnc. am i right assuming these pins are unrecoverably busted?

You are not right, not yet !
7i92 will have all IO at 5V as it has pull up resistors on all IO also used for level shifting to 5V tolerance as the FPGA is a 3.3V part.
Take this with a grain of salt, PCW is the master of Mesa, so waiting for him is always time well spent.

All I/O high after an error free LinuxCNC start probably means that
one or both of the bus switches has been damaged. This can happen
if voltages > +7V or less than -0.5V have been applied to any IO pin.

Typically damage is more likely from negative inputs. Even touching
and I/O pin to frame ground can damage the card because its easy
to have a more than 0.5V difference between 7I92 5V power ground
and frame ground when high frequency EMI is present.

to rephrase:
not all pins go high - only the 2 pairs i had wrongly wired to the second motor/controller. the first one still works fine.

my question still stands - is there a bit-file to be found that configures the P1 the same way as P2 is with the default firmware? am i assuming correctly that the P1's pins still all should work fine?

thanks or all your wisdom,
markus.

oh, wait.

Note: 26 pin header P1 will match standard parallel port pin-out if terminated with flat cable 26 pin receptacle/DB25F cable with pin1s connected (and header pin 26 left open)

could someone please clarify what 'with pin1s connected' means?
 

DB25 pin 1 connects to HDR26 pin 1