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Thanks Martin, I have also received a reply from QHY, and he says that he was the manufacturer, and says much the same as you,
"Hello,
This EQ4 is designed many years before. To reverse the direction.You can modify it as the follow method.
The step motor has five wires.
1 Common pin
2 driver A
3 driver B
4 driver C
5 driver D
You can exchange the pin to :
1 Common pin
2 driver D
3 driver C
4 driver B
5 driver A
Or
1 Common pin
2 driver B
3 driver A
4 driver D
5 driver C
But I am not sure which method is right.You need have a try."
So thanks to you all for your very helpful advice.
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