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A 7I74 and 7I84U would be a bit more flexible.
 
The 7I84U has these advantages over the 7I84:

Each output can be sinking, sourcing, or push-pull

No flyback diodes needed on outputs up to full (500 mA) current

Are 7i74 and 7i84 boards available now? I have to add a topolchanger to a big system I did years back and I need to add a I/O board to a 5i25 on the second port.

Was thinking a 7i74 and a 7i84. Any thoughts or a better idea?

Thanks,

Bob

7I96S    CL57
+5V     PUL+
STEP-   PUL-
+5V     DIR+
DIR-     DIR-

SW3 Set for 5V mode

The ENA, ALM and BRK can be left unconnected

NC means no connection, so don't connect the ENA pins.

Also make sure that the CL57 is set for 5V inputs