I recently asked Open a cash drawer using a RJ11 DIO 12/24V port in Windows 7, and while looking for an answer I contacted the customer support of Shuttle.
They replied with a message which was a bit like this:
Please find attached a software tool for your request, you can use it by doing [...].
So basically, this solved my problem, but I cannot give the software to anyone since it is not mine, so basically the only answer I could write would be like:
For anyone having the same issue, you should contact Shuttle support [...].
...which I don't know if it is acceptable. What should I do with that question?