I have acquired a older multicam machine and am having issues with loading programs using the DNC. The controller shows it is a Machine Automation V3.37a m23 i3.58. I did not receive a factory cable so have been using a serial cable with a null modem adapter. It loads small programs up to 2K and runs great, however when loading anything larger it either contains some erratic moves or list an axis as out of range. I assume it lost some data in transfer. Any suggestions?