![]() Because response time of server devices is not specified by the standard, and device manufacturers also rarely specify a maximum response time, broadcast features are rarely used. So, the client needs to wait for a response, or timeout before sending the next command.Ī broadcast address is specified to allow simultaneous communications with all servers. Server devices only process one command at a time. ![]() The amount of data in the packet will vary, depending on the command sent to the server. The server will respond with a message beginning with its address, followed by the function code, data, and a checksum. Modbus servers, in turn, remain silent, communicating only when responding to requests from the Modbus client.Įvery message from the client will begin with the server address, followed by the function code, function parameters, and a checksum. Only the Modbus client can initiate communications. However, each Modbus server on a shared network has a unique address from 1 to 247.Ī single Modbus client device initiates commands (requests for information), sending them to one or more Modbus server devices on the same network. In a standard Modbus network, there is one client and up to 247 servers. ![]() The device requesting the information is called the Modbus client, and the devices supplying information are Modbus servers.
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