Summary: The article introduced Ruisaite to grow line isolator to correspond to apply mediumly in numerical control machine tool. The chip that introduced RS-232 interface simply to allow circuit of easy attaint interface above all and transmission space is limited wait for inadequacy, introduced Ruisaite next GC-9D and GC-25T two long term on the basis that isolator is not altering interface of original RS-232 hardware and software process designing, lengthen RS-232 to transmit a distance, introduced Ruisaite in detail finally the GC-9D application in communication of numerical control machine tool. Key word: RS-232; GC-9D; GC-25T; Long term isolator; The ceaseless development of foreword of numerical control machine tool as computer technology, the industry that in industrial control benefit has data corresponds with the computer controls application more and more extensive also. The number between the computer and computer or computer and terminal unit can use serial communication and collateral news report according to transmitting two kinds of means. Serial communication means has use line little, cost is low, be in especially when be being transmitted remotely, those who avoided many circuitry character is abhorrent and be used extensively. RS-232 is American electron guild (EIA) the interface standard of the serial data news report that make, RS-232 interface is current interface of a the most commonly used kind of serial communication. The signal n of the insufficient RS-232 interface of RS-232 is between 15V of ± of ± 3V ～ , n cost is higher, contain the chip of circuit of easy attaint interface, transmission space of RS-232 interface standard is limited at the same time, when baud rate is 9600bps, the largest transmission space is 15 meters. Appeared ceaselessly so if a few new interface standards are RS-422, RS-485, fiber-optic etc. As a result of these inadequacy of RS-232, standard of interface of RS-232 of throw the helve after the hatchet? Does the control system that has used RS-232 interface level so change afresh communication interface? If change afresh interface, original system needs to debug a process again, cost is too high. So have both neither to change interface standard, where is the solution that does not need too high cost again? The answer is affirmative. Article introduction uses Ruisaite one kind to grow line isolator, on the basis that does not alter interface of original RS-232 hardware and software process designing, lengthen RS-232 to transmit the solution of the distance. Ruisaite grows line isolator Ruisaite GC-9D and GC-25T are two long term isolator, but the beyond distance transmission hair, ground, RS-232 signal that receives 3 lines. GC-9D joins the RS-232 interface of 9 core, GC-25T joins the RS-232 interface of 25 core, use in couples. Double skeining thread is used to join between isolator, most Sunday run can amount to 1000 meters. Isolator two end join respectively the computer of RS-232 interface and terminal unit. Interior of isolator of line of lucky contest specialty uses photoelectricity to change a technology to make between circuit of computer RS-232 interface and circuit of interface of terminal unit RS-232 electric each other are kept apart. If the graph is shown 1 times,GC-9D principle pursues, if the graph is shown 2 times,GC-25T principle pursues. From the principle the graph can see GC-9D and GC-25T principle are same, receive type of degree of lip-rounding to differ only, it is with GC-9D below exemple undertake demonstrative. Graph 1: GC-9D principle graph pursues 2: The 9 core Kong Zhi of GC-9D of GC-25T principle graph receives join data terminal unit (Data Terminal Equipment, abbreviation DTE) ; With equipment of data news report (Data Communication Equipment, abbreviation DCE) when join, need link of 2-3 across line. GC-9D interior uses the technology that steal report to obtain power supply from RS-232 interface, need not exterior power supply. Carry from 9 core aperture at the same time 7 bring a foot to get auxiliary power supply, when joining with nonstandard RS-232 interface when GC-9D or be apart from further signal when serious attenuation, receive from 7 feet - 7V comes - 12V power source, can increase quota further, safeguard communication stability undertakes. GC-9D pursues in the application in communication of numerical control machine tool the 3 graphs connecting a line in be GC-9D to correspond in numerical control machine tool. Communication interface of numerical control machine tool is the RS-232 standard interface of 9 down-lead, interface definition is DCE. Accuse interface of machine RS-232 standard with labour linear (not across) join. Graph 3: The noise when the GC-9D application in communication of data machine tool works as a result of numerical control machine tool is tremendous, shake intense, produce a lot of dust at the same time, so labour accuses machine must be far from numerical control machine tool, place in in accuse indoor. And in accuse machine tool of room space numerical control to be in 100 meters of above, the largest transmission space that exceeds RS-232 15 meters, straight successional line cannot correspond. GC-9D can transmit RS-232 signal 1000 meters, accuse in labour if the graph is shown 3 times,a pair of GC-9D are added between machine and numerical control machine tool. The 9 aperture of the GC-9D-I in the graph and labour accuse chance is direct join, the 9 aperture of GC-9D-II and across of interface of RS-232 of numerical control machine tool join (the RS-232 standard interface that is 9 down-lead because of communication interface of numerical control machine tool, interface definition is DCE) , the 9 needles end of the 9 needles end of GC-9D-I and GC-9D-II is 9 aperture head to grow 100 meters double skeining thread to join by two end, graph 4 for double skeining thread the two join that carry 9 Kong Yin feet pursue. Graph 4: GC-9D and GC-9D are even flow of line attempt work: Labour accuses signal of machine RS-232 n to be changed into voltaic signal by GC-9D-I, pass to GC-9D-II through double skeining thread, in GC-9D-II end restores RS-232 n signal again, convey numerical control machine tool; Signal of n of RS-232 of numerical control machine tool is changed into voltaic signal by GC-9D-II, pass to GC-9D-I through double skeining thread, in GC-9D-I end restores RS-232 n signal, convey to accuse to labour machine. Make the longest can transmit 15 meters of far RS-232 signal to transmit a distance to raise 100 meters of above only. GC-9D interior uses photoelectricity to keep apart a technology, dominate industry machine and numerical control machine tool between electric each other are kept apart, protected two end RS-232 interface circuit won't suffer voltage damage, at the same time GC-9D need not exterior power supply. The labour in this application accuses machine end and end of numerical control machine tool to all be RS-232 signal, labour accuses machine interface circuit and circuit of interface of numerical control machine tool to was not revised, labour accuses machine and software of numerical control machine to also was not revised, RS-232 signal transmission distance rises below the circumstance that so GC-9D all does not alter in original RS-232 hardware and software to 100 meters of above, make two end electric at the same time each other are kept apart. When the RS-232 interface that when communication two end are 25 core, with two long term isolator GC-25T is used in couples, it is the RS-232 interface of 9 core when one aspect of the matter, and when another end is the RS-232 interface of 25 core, with long term isolator GC-9D is as long term as isolator GC-25T is used in couples. Above introduced to be aimed at the solution that lengthens the hair, ground, RS-232 signal that receives 3 lines only, lucky contest still has in specialty line isolator in the light of what contain handclasp signal long term isolator, the basis such as GC-25E, GC-315, GC-25A, PC9, GC-PC handclasp signal is different and what interface form differs to all have different type is long term isolator. Conclusion is in original in the control system that uses RS-232 communication, isolator of line of specialty of use luck contest is not changing hardware interface chip and the condition that do not alter software to fall, lengthen RS-232 signal reach 1000 meters, make original RS-232 system and the instrument appearance that contain RS-232 port continue to be able to continue to apply, because distance of patulous, communication increases control system,reduced greatly brought cost and system debug difficulty. CNC Milling