An RF module 51 to control RC500 example. I have the test. Good performance.

AT89s52+RC500_source code
..........................\AT89s52+RC500_source code
..........................\..........................\AT89S52.H
..........................\..........................\HY500
..........................\..........................\HY500.lnp
..........................\..........................\HY500.M51
..........................\..........................\HY500.Opt
..........................\..........................\HY500.plg
..........................\..........................\HY500.Uv2
..........................\..........................\HY500LCD
..........................\..........................\HY500LCD.lnp
..........................\..........................\HY500LCD.M51
..........................\..........................\HY500LCD.plg
..........................\..........................\hyRC500.Opt
..........................\..........................\KEIL.DSK
..........................\..........................\KEIL.PRJ
..........................\..........................\m500a.h
..........................\..........................\main.c
..........................\..........................\main.c.bak
..........................\..........................\main.h
..........................\..........................\main.LST
..........................\..........................\main.OBJ
..........................\..........................\Mfreg500.h
..........................\..........................\RC500 DEMO
..........................\..........................\RC500 DEMO.hex
..........................\..........................\RC500 DEMO.lnp
..........................\..........................\RC500 DEMO.M51
..........................\..........................\RC500 DEMO.plg
..........................\AT89S52.H
..........................\HY500
..........................\HY500.lnp
..........................\HY500.M51
..........................\HY500.Opt
..........................\HY500.plg
..........................\HY500.Uv2
..........................\HY500LCD
..........................\HY500LCD.lnp
..........................\HY500LCD.M51
..........................\HY500LCD.plg
..........................\HY500_Opt.Bak
..........................\HY500_Uv2.Bak
..........................\hyRC500.Opt
..........................\KEIL.DSK
..........................\KEIL.PRJ
..........................\m500a.h
..........................\main.c
..........................\main.c.bak
..........................\main.h
..........................\main.LST
..........................\main.OBJ
..........................\Mfreg500.h
..........................\RC500
..........................\.....\M48020.pdf
..........................\.....\MF RC500.doc
..........................\.....\MF RC500电路匹配与设计.pdf
..........................\.....\MfRC500电路图.pdf
..........................\.....\rc5000.txt
..........................\RC500 DEMO
..........................\RC500 DEMO.hex
..........................\RC500 DEMO.lnp
..........................\RC500 DEMO.M51
..........................\RC500 DEMO.plg
..........................\rc500_c语言库函数
..........................\.................\ChangeCodeKey.c
..........................\.................\ClearBitMask.c
..........................\.................\PcdAntennaOff.c
..........................\.................\PcdAntennaOn.c
..........................\.................\PcdAnticoll.c
..........................\.................\PcdAuthKey.c
..........................\.................\PcdAuthState.c
..........................\.................\PcdComTransceive.c
..........................\.................\PcdConfigRestore.c
..........................\.................\PcdHalt.c
..........................\.................\PcdLoadConfig.c
..........................\.................\PcdLoadKeyE2.c
..........................\.................\PcdRead.c
..........................\.................\PcdReadeE2.c
..........................\.................\PcdRequest.c
..........................\.................\PcdRestore.

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