![]() For either format you will need the drop number of the device you are communicating with since sometimes multiple Modbus devices will exist on a single network.Ĥ) You will need software that can form and send Modbus request packetsĪnd receive and parse the Modbus response packets.įor more details on what these packets look like refer to the Modbus specification under technical information at. RTU you will need to write software to send command/response bytes between LabView and the micro controller. ASCII you could in theory use a terminal program and manually type in the requests and receive responses. In order to communicate with a Modbus device you must first know what format of Modbus is being used this will be ASCII or RTU. Typically baud rate varies from controller to controller, but the remaining parameters will almost certainly be 8 data bits, 1 stop bit, no parity, and no flow control.ģ) What are the parameters of the Modbus connection? You will need to know baud rate, data bits, stop bits, parity, and whether or not there is any flow control being used. Based on your question I'm going to assume you've already determined that it is RS-232.Ģ) What are the parameters of the RS-232 connection? ![]() Modbus can be transported over a RS-232, RS-485, or Ethernet. There are a number of questions you need to answer before connecting to a Modbus interface: ![]()
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