For some situations, we use several practical and advanced data transmission devices to change the portable type into a fixed transmission mode, improve reliability, greatly facilitate the operation process and programming, reduce downtime, and greatly accelerate. The data transfer speed of CNC machine tools. The following is a brief introduction to the application of several practical data transmission devices. DNc numerical control information transmission device, the blade workshop is more concentrated because of the numerical control machine tools, and adopts a set of DNC numerical control information transmission devices, including a set of DNC servers, a variety of DNC drivers, 2 sets of serial and parallel converters of FNAU7C and corresponding cable plugs. Connector. The function of the DNC service server system is as follows: (1) The system can be equipped with a variety of drivers 7F (FANUC7), AB (AB840, 926), F18 (FANUC18), SIE (SIEMEN8S10) and so on. (2) The server can connect up to 16 machine tools, and now it has 10 units. (3) Program the computer to the DNc server, and then connect to each machine according to the serial interface, and connect directly with a three-core shielded cable. (4) The DNC server adopts a broadcast transmission method. Configure communication interface parameters on each machine, such as AB840 CNC, set in 10 configuration of (AB84X): COMPUTER mode, bidirectional, (24X) baud rate, data bit 7, stop bit 2, even school, etc. Parameters, according to oLAD for receiving, SAVE for sending. If the DNC server wants to receive the program sent by the AB840O CNC, it must be in the remote control switch and three intermediate relays (because the four oil heaters have four sets of lines, the normally open contacts of the intermediate relays KAI, KAZ, KA3 respectively For near-control switching and heating control of four oil heaters). (Finish)