Modbus protocol has become an important industrial area of the field bus standard. Using C language source code describes the implementation of the Modbus protocol.

Source
......\applyPLAY.c
......\COMMU.C
......\core
......\....\dhcp.c
......\....\inet.c
......\....\IPv4
......\....\....\icmp.c
......\....\....\ip.c
......\....\....\ip_addr.c
......\....\....\ip_frag.c
......\....\....\vssver.scc
......\....\mem.c
......\....\memp.c
......\....\netif.c
......\....\pbuf.c
......\....\tcp.c
......\....\tcp_in.c
......\....\tcp_out.c
......\....\udp.c
......\....\vssver.scc
......\CRC.C
......\F34x_CP220.c
......\include
......\.......\arch
......\.......\....\cc.h
......\.......\....\perf.h
......\.......\....\sys_arch.h
......\.......\....\vssver.scc
......\.......\ipv4
......\.......\....\lwip
......\.......\....\....\icmp.h
......\.......\....\....\inet.h
......\.......\....\....\ip.h
......\.......\....\....\ip_addr.h
......\.......\....\....\ip_frag.h
......\.......\....\....\vssver.scc
......\.......\lwip
......\.......\....\arch.h
......\.......\....\debug.h
......\.......\....\def.h
......\.......\....\dhcp.h
......\.......\....\err.h
......\.......\....\mem.h
......\.......\....\memp.h
......\.......\....\netif.h
......\.......\....\opt.h
......\.......\....\pbuf.h
......\.......\....\snmp.h
......\.......\....\stats.h
......\.......\....\sys.h
......\.......\....\tcp.h
......\.......\....\udp.h
......\.......\....\vssver.scc
......\.......\memory.h
......\.......\netif
......\.......\.....\CP220x_CORE.h
......\.......\.....\CP220x_REG.h
......\.......\.....\etharp.h
......\.......\.....\ethernetif.h
......\.......\.....\OP_FlashOfCP220.h
......\.......\.....\vssver.scc
......\.......\NORMAL.H
......\.......\sysdef.h
......\.......\vssver.scc
......\init.c
......\main.c
......\master.c
......\memory.c
......\modbus.c
......\modbus.h
......\netif
......\.....\CP220x_CORE.c
......\.....\CP220x_REG.c
......\.....\etharp.c
......\.....\ethernetif.c
......\.....\OP_FlashOfCP220.c
......\.....\vssver.scc
......\P2P.c
......\send.c
......\TCPIPmodbus.c
......\TIMER.C
......\T_box.plg
......\vssver.scc

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