Changed files are 51 single-chip communication content and processes, including the application of RS-232 and RS-485 communication with the host computer can also communicate with the PC machine.

串口\002.txt
....\51单片机RS485通讯程序\HY502.h
....\.....................\main.c
....\.....................\main.h
....\.....................\main.LST
....\.....................\main.OBJ
....\.....................\REG52.H
....\.....................\RS485
....\.....................\RS485.lnp
....\.....................\RS485.M51
....\.....................\RS485.Opt
....\.....................\RS485.plg
....\.....................\RS485.Uv2
....\.....................\RS485_Opt.Bak
....\.....................\RS485_Uv2.Bak
....\51单片机RS485通讯程序
....\串口modbus.rar
....\第二章\2.1异步通信软件模拟\iofor232.c
....\......\...................\iofor232.LST
....\......\...................\iofor232.OBJ
....\......\...................\iofor232.Opt
....\......\...................\iofor232.plg
....\......\...................\iofor232.Uv2
....\......\...................\iofor232_Uv2.Bak
....\......\2.1异步通信软件模拟
....\......\..2基于RS-232的串口通信\RS232.c
....\......\.......................\VB程序.txt
....\......\2.2基于RS-232的串口通信
....\......\..3基于RS-485的多机通信\master.lnp
....\......\.......................\master.M51
....\......\.......................\master.Opt
....\......\.......................\master.plg
....\......\.......................\master.Uv2
....\......\.......................\master485.c
....\......\.......................\master485.LST
....\......\.......................\master485.OBJ
....\......\.......................\master_Opt.Bak
....\......\.......................\master_Uv2.Bak
....\......\.......................\slave.c
....\......\.......................\slave.LST
....\......\.......................\slave.OBJ
....\......\2.3基于RS-485的多机通信
....\......\..4 I2C总线协议的软件实现\viic.c
....\......\.........................\viic.LST
....\......\.........................\viic.OBJ
....\......\.........................\viic.Opt
....\......\.........................\viic.plg
....\......\.........................\viic.Uv2
....\......\.........................\viic_Opt.Bak
....\......\.........................\viic_Uv2.Bak
....\......\2.4 I2C总线协议的软件实现
....\......\..5 SPI总线在单片机系统中的实现\SPI
....\......\...............................\SPI.ASM
....\......\...............................\SPI.c
....\......\...............................\SPI.lnp
....\......\...............................\SPI.LST
....\......\...............................\SPI.M51
....\......\...............................\SPI.OBJ
....\......\...............................\SPI.Opt
....\......\...............................\SPI.plg
....\......\...............................\SPI.tmp
....\......\...............................\SPI.Uv2
....\......\...............................\SPI_Opt.Bak
....\......\...............................\SPI_Uv2.Bak
....\......\2.5 SPI总线在单片机系统中的实现
....\......\..61-wire\1-wire.c
....\......\.........\1-wire.LST
....\......\.........\1-wire.OBJ
....\......\.........\1-wire.Opt
....\......\.........\1-wire.plg
....\......\.........\1-wire.Uv2
....\......\.........\1-wire_Opt.Bak
....\......\.........\1-wire_Uv2.Bak
....\......\2.61-wire
....\第二章
串口

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