The problem is, we don't know your laser, so it's hard for us to help you. Anyway, Moncha uses standard ILDA cable:
1 X+ /-5 to +5V/
2 Y+ /-5V to +5V/
3 Blanking TTL /0V or +5V/
4, 17 Interlock /inside of device connected together/
5 Red /0V to +5V/
6 Green /0V to +5V/
7 Blue /0V to +5V/
8 Dark blue /0V to +5V/
9, 10, 11, 12, 24 Not connected
13 Shutter /0V for blanked, +5V for visible/
14 X- /-5 to +5V/
15 Y- /-5 to +5V/
If you connect it like this, it should work. We've seen other companies to use even Ethernet cable instead of ILDA - well it's working, but we don't recommend it.
Usually the problem is with Interlock. Some lasers use pins 4 and 17 of DB-25 to detect, whether the external laser show controller is connected. If this is not connected inside ILDA cable (which is quite common, since you save some wires), there's no way for laser to know, there is external control required. Easiest way is to short manually pins 4 and 17 on your ILDA cable.
But some of the lasers also need to set the DIP switch to certain position (e.g. 0) to be able to use external control. This is something you need to consult with your laser manufacturer.
Yes, you can buy license for Fiesta software, it's 400 EUR. This will activate device to "master", which allows you to use Fiesta software. Then you can use also other Moncha devices as "slaves" - additional outputs for Fiesta software.
There is a little software in the Fiesta installation called MonchaForFiesta.exe (in C:\Program Files (x86)\Fiesta.NET). After you run it, you have to put activation code there and it'll activate the hardware to master.
Unfortunately, master activation is only one-way - it can't be deactivated. We would need to send you the device there and back. No problem about that, it's just you would have to pay all the shipping cost.