routines to manage by polling a serial (RS232) node Modbus RTU slave. The microcontroller on which it was implemented is LPC1768. The routine for performing the CRC16 checksum is very small and very fast. MODBUS-SLAVE is complete. VERY INTERESTING.

modbus的03 06 简易功能，为了使用者方便已经搭建好处理架构和CRC16校验（校验码0xA001）-modbus protocol with 03 06 operation code, which is included CRC_16 (code:0xA001)