#MODBUS RTU SERIAL COMMUNICATION PROTOCO PDF#
#MODBUS RTU SERIAL COMMUNICATION PROTOCO VERIFICATION#

#MODBUS RTU SERIAL COMMUNICATION PROTOCO VERIFICATION#

The method is achieved through the steps of firstly, setting the baud rate of a serial port as the default baud rate when a slave station is powered on, waiting for receiving a serial port message on a bus, resetting the baud rate of the serial port as the agreed next baud rate of a master station and the slave station if the messages unceasingly received five times are wrong messages till a correct serial port message is received, and achieving communication with the master station with the baud rate secondly, changing the baud rate of the master station under the normal communication condition, detecting whether the received message on the bus is correct or not in real time through the slave station, repeatedly executing the baud rate matching process if the wrong messages are unceasingly received five times till the correct message is received, judging the data format based on a MODBUS communication protocol according to whether the message received by the slave station is correct or not, and conducting verification, wherein a CRC verification code and the length of the whole message are mainly verified.

The invention discloses an automatic MODBUS-RTU communication baud rate matching method. 230000005540 biological transmission Effects 0.000 description 1.238000005516 engineering processes Methods 0.000 description 2.

239000011800 void materials Substances 0.000 description 3.

239000002674 ointments Substances 0.000 claims description 4.

238000000034 method Methods 0.000 claims abstract description 8.

238000004891 communication Methods 0.000 title claims abstract description 33.

Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by Hunan Super Information Co Ltd filed Critical Hunan Super Information Co Ltd Priority to CN201410289938.XA priority Critical patent/CN104052579A/en Publication of CN104052579A publication Critical patent/CN104052579A/en Status Pending legal-status Critical Current Links Original Assignee Hunan Super Information Co Ltd Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Inventor е‘Ёж™“еі° й‚“еђ› Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Pending Application number CN201410289938.XA Other languages Chinese ( zh)

#MODBUS RTU SERIAL COMMUNICATION PROTOCO PDF#

Google Patents Automatic MODBUS-RTU communication baud rate matching methodДownload PDF Info Publication number CN104052579A CN104052579A CN201410289938.XA CN201410289938A CN104052579A CN 104052579 A CN104052579 A CN 104052579A CN 201410289938 A CN201410289938 A CN 201410289938A CN 104052579 A CN104052579 A CN 104052579A Authority CN China Prior art keywords baud rate message communication bus slave station Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents CN104052579A - Automatic MODBUS-RTU communication baud rate matching method

CN104052579A - Automatic MODBUS-RTU communication baud rate matching method

Modbus rtu serial communication protoco