How to wire the enable pin on a stepper drive?

[cncJim]

Merry Christmas! Thanks for the replies and advice Clive and Jazz.

I am following the sample circuit from the Mach3 manual:-


Would using this give everything needed or is there something extra to do/add?

When talking about the charge pump, is that essentially the ENA- pin of my BoB?

Thanks,

Jim

[cncJim]

Hi all,

I haven't got round to testing the enable pins on the drives yet as I need to order the correct connectors (http://uk.rs-online.com/web/p/non-fu...locks/1896010/ in case it's useful to others).

I have tested the enable pin on th BoB and got a slightly odd result:-

1. BoB off, PC on - 2.26v
2. BoB off, PC on, Mach 3 loaded - 1.09v
3. Mach3 loaded, BoB on, emergency stop active - 4.97v
4. Mach3 loaded, BoB on, ES reset - 195mv
5. Mach3 not running, BoB on - 4.9v
6. PC off, BoB on - 4.9v

So they all look ok to me except for number 2. From what I understand TTL levels a Low is 0v to 0.8v and a High level is 2v to 5v so a voltage of 1.09v is neither low of high which may or may not cause problems.

Anyone expirence this kind of thing before?

Thanks,
Jim