To get started on the right foot it may be best to contact Galil directly on this issue. This is a special case. Most people don't have to do this. I myself never had to use resister pack or build build special circuits. But it is possible to do this. If you contact Galil they can help you and make sure that your circuit will not damage the board. I've been using Camsoft for years and this sounds like a deep subject that is best explained by someone that really knows what their doing.