modbus serial communication

abnormally { if(Currentserialport.isopen = =false)//determine the current serial port status, if Comport.isopen==false, the serial port is missing{setcomlose (); } Else//Unable to close the serial port for unknown reason { Throw NewException ("unable close

void delay (unsigned int x);void Act_bit (void);extern bit busy;extern unsigned int buf_num;extern U8 Rev_buf[6];extern int red_value;extern int greed_value;extern int blue_value;extern int white_value;extern int yellow_value;extern int k1_value;Process data by received datavoid Act_bit (void){AA F9 01 Red Green Blue DD value 0~100 rev_buf[1] = = 0xf9if (rev_buf[0] = = 0xaa rev_buf[6] = = 0XDD){if (rev_buf[2] = = 0x01)//Turn on the light command{if (rev_buf[1] = = 0xf9)//With STM32 protocol ge

At present, there are two main ways to send data: active continuous sending mode and passive command and answer sending mode.To send data, serial communication, the first to set the communication parameters.Serial communication first sets the communication parameters.The fir

In the past few days, the serial port communication of arm was achieved. Because of the previous single-chip microcomputer basics, we chose 51 single-chip microcomputer and Its experiment. The experiment is to compile a serial communication program under Linux, compile the program, and download it to the arm board for

is currently accepted \ rThe 9th to 14th bit represents the amount of data that the system redundantly sends while waiting for processingLoad adaptive for post-communication systemsvoid Transserialscommand(u8 res){U8 Lostcount;U8 Receivecount;Receive data processingif (serialstatus (1))//already received, this data is discarded{Lostcount = ((U8) (serialstatus>>9)) 0x3f; Missing data countif (lostcount 0x3f)lostcount+ +;Serialstatus = ~ (0x3f9);Seri

There are three methods for implementing serial communication in VC: MSComm, API, and serial communication. But in actual programming, the MSComm control is not easy to use, and the API is more troublesome. We recommend that you use the serial port class (please search and

workspace, create the Boost_bode.cpp file with the following contents:First, test the function module that relies only on the header file:ASIO not only supports network communication, but also supports serial communication. For two devices to use serial communication, the k

1-in C + + Builder 6.0 based on API functions to write serial communication program introduction: In the Dos/win95/win98 era, the operating system of the serial port is not protected, that is, the serial port of the resources are fully open to users, users can use the direct operation of the hardware functions (such

));The callback function of serial port is set up by using Ets_uart_intr_attach Uart0_rx_intr_handlerIn the Uart0_rx_intr_handler there are various signs of interruption, the normal situation will enter the Uart_rxfifo_tout_int_st, that is, stop the transmission time exceeded the set?Limit value, and then call System_os_post to send a message to the task Uart_recvtask created in the initialization function Uart_init, and then everyone look at Uart_rec

The following is my own serial port receiving class. The serial port sending is simple and you can simply send it. The following class can be used directly. Package com. boomdts. weather_monitor.util; import java. awt. *; import java. awt. event. *; import java. io. *; import java. util. *; import javax. comm. *; import com. boomdts. weather_monitor.biz.RecvCommand; import com. boomdts. weather_monitor.uti