lazarus下的多线程编程应用，可以看看，大家开心-lazarus under the application of multi-threaded programming

支持原生ModBus协议的Delphi控件-ModBus protocol to support native Delphi control

Delphi开发的modBus通信库，采用TCP/IP协议，可用于实现MODBUS上的主从通信编程。- The library provides components to implement both a ModBus master and a Modbus slave, and is based on the Indy component set (both Indy 9 and 10 are supported)