modbus c library

Application Data unit is also divided into 2 cases: first, as a client, the server issued a command, and the second, as a server, the response to the client command. So we encapsulate each of these two scenarios as 2 basic functions:(1), as a TCP client, generate commands to read and write to the TCP server object:/* Generate commands to read and write server objects */uint16_t Syntheticreadwritetcpservercommand (objaccessinfo objinfo,bool *statuslist,uint16_t *registerList,uint8_t * Commandbyt

received list of information. In addition, we need to implement 8 callback functions according to the specific needs to complete the operation of the Modbus object, the prototype of the 8 functions are as follows: /* Get the value of the amount of coil you want to read */ void Getcoilstatus (uint16_t startaddress,uint16_t quantity,bool *statuslist); /* Get the value of the amount of inputstatus you want to read */ void Getinputstatus (uint16_t starta

multiple register states */Static uint16_t Handlewritemultipleregistercommand (uint16_t startaddress,uint16_t quantity,uint8_t *receivedMessage , uint8_t *respondbytes)We then define an array of function pointers to invoke this function:uint16_t (*handleclientcommand[]) (uint16_t,uint16_t,uint8_t *,uint8_t *) ={handlereadcoilstatuscommand,Handlereadinputstatuscommand,Handlereadholdingregistercommand,Handlereadinputregistercommand,Handlewritesinglecoilcommand,Handlewritesingleregistercommand,Han

Handlereadinputregisterrespond (uint8_t *receivedmessage,uint16_t startaddress,uint16_t quantity)Similarly, we also define a function pointer array to implement the invocation of these functions:void (*handleserverrespond[]) (uint8_t *,uint16_t,uint16_t) ={handlereadcoilstatusrespond, Handlereadinputstatusrespond, Handlereadholdingregisterrespond, handlereadinputregisterrespond};Here, the main station of the RTU package is complete, of course, the specific data processing parts need to develop

in the client (master) application}/* Update the Read-Back coil status */__weak void Updateinputresgister (uint16_t startaddress,uint16_t quantity,uint16_t *registervalue){Implemented in the client (master) application}In the development of specific applications, we only need to implement the corresponding function in the application can make the function complete, as to how the specific data processing, it depends on the application of the data format. Of course these functions do not all need

,Handlereadinputstatuscommand,Handlereadholdingregistercommand,Handlereadinputregistercommand,Handlewritesinglecoilcommand,Handlewritesingleregistercommand,Handlewritemultiplecoilcommand,Handlewritemultipleregistercommand};3 , generating a Slave responseAfter processing also need to generate the corresponding information from the machine, whether it is a read operation command or write command, we all in the corresponding function code processing to generate a response message. This way, when de

supported opcode is 8, theoretically corresponding to each function code will have a different operation, but in fact, because the write operation command has no need to do any action, So the corresponding operation is actually only 4 function codes of the read operation./* Process read slave State amount return information, read coil status bit 0x01 function code */static void Handlereadcoilstatusrespond (uint8_t *receivedmessage,uint16_t startaddress,uint16_t quantity)/* Process read slave St

Modbus SlaveThis is the installation package Modbusslavesetup64bit registration code:54555451475662Modbus Communication Protocol Net LibraryThis is a lot of open source libraries, my side of the library is GitHub's open Source implementation class Library: Nmodbus4,github address: HTTPS://GITHUB.COM/NMODBUS4/NMODBUS4I use

Tags: basic define ref show next private string complex lengthPrefaceThis article will use a NuGet exposed component technology to implement a Modbus RTU client, easy to read and write to the Modbus RTU server, this server can be a computer-side C # design, can also be implemented by the PLC, or any other server to support this communication protocol.GitHub Address: Https://github.com/dathlin/HslCommunicati

Tags: COM add blog electronic share mic int sig jpgModbus protocol display |modbus Communication display |modbus display electronic screen function code sharing, mainly used to achieve "preset multiple register function code." The "0X1F" function code of the MODBUS-RTU protocol is photographed as follows: An example of the "0X1F" function code for the

Tags: arp application nic mobile number control Nid successful LAN AckPrefaceThis article will use a GitHub exposed component technology to implement a special-shaped Modbus TCP client, convenient for the special-shaped Modbus TCP server to read and write, this server can be computer-side C # design, can also be a special device to achieve, It can also be any other server that supports this communication pr

Label:Recently hand on a Unity3d project, this project needs and real machine linkage, and the real machine linkage we need to pass the Modbus protocol. So modbus this piece of me to achieve, because the project is best packaged as Android, so Java to do, see the next Java there are really a lot of relevant libraries, and finally decided to use Jamod this library

the dialog box below. Set the required configuration information, IP address if it is the local set to 127.0.0.1. Here the customer may have a question: how to set the Modbus port in DSC, why only the IP address number and no port number? The answer here is that the default port number under DSC is 502, and the user is not allowed to configure under DSC. Customers can refer to the NI official online "MODBUS