The MICRO DNC is used to send and receive CNC program files between a CNC control and a USB memory stick. The MICRO DNC connects to the CNC control via RS232 port. It can also ?drip feed? the CNC control - providing that the CNC control is capable of receiving and executing a G code program via its RS232 port. . If you are interested in the "wired LAN connection with RJ45 . port" function, you can access our store https://www.ebay.com/itm/304375359030 Note: Order will be shipped with item as MICRO DNC 3A (NEW DESIGN) transfer program into CNC machine memory transmit DNC drip program (works in TAPE mode) receive program or PC / PARAMETER from CNC machine with 2-4GB internal memory, USB reader support with large capacity has RS232 DP9 communication port There are 3 rear mounted magnets of the device that make it easy to put DNC on CNC machines connect LAN to the computer via WIFI, there will be a software installed on the computer to convert files between the computer and MICRO DNC 3A PACKAGE INCLUDES 1DNC + 1 CABLE + 1 ADAPTER NOTE: You can power the MICRO DNC via CABLE RS232, PIN 25 = 24V . If on the 25 pin of RS232 on the CNC machine with power(24VDC) you can not use 12vdc adapter