Agile mode for Modbus network protocol

Details Agile mode for Modbus network protocol Agile mode for Modbus network protocol

2005-04-12

2005-04-12

Knight, Anthony (Department: 2121)

Electrical computers and digital processing systems: multicomput

Computer-to-computer protocol implementing

C709S228000, C709S231000, C709S236000, C709S217000, C709S227000, C370S464000, C370S468000, C710S008000, C710S014000, C710S033000, C710S060000

Reexamination Certificate

active

06880015

ABSTRACT:
A Modbus slave device is operable in an agile mode that allows the slave device to automatically interpret and respond to first-type and second-type message frames conveyed to the slave device by a master device. The slave device detects a first incoming character of a master query message frame generated by the master device. If the first incoming character is a prompt character for the first-type message frame, the slave device interprets the master query message frame as the first-type message frame. If the first incoming character is not the prompt character for the first-type message frame, the slave device interprets the master query message frame as the second-type message frame. If the slave device is addressed in the master query message frame, the slave device performs the command associated therewith and, if required by the command, generates a responsive slave message frame of the same type as the master query message frame.

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Modicon Modbus Protocol Reference Guide, Modicon, Inc., Industrial Automation System, Jun. 1996, pp. 1-115.

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