For you to modify will have to disassemble CPM1 and to weld four wires direct in the pins of the periphreal port, underneath, for not damaging the original connector. In the other extremity of the threads you anger to install a connector DB9 female, that it should have been fastened beside CPM1. you had not needed any interface. The communication only works with Cx-Programmer any version. Adapting_the_peripheral_port_for_PC.pdf