Patent ID: 7694051
Filing Date: 2010-04-06
Classification: H04L

Abstract:
1. A method of detecting master/slave response time-out under continuous packet format communications protocol, which calculates the time required for a detection device functioning as a Modbus master to receive a response from a slave device in response to a Modbus request sent by the detection device subject to Modbus TCP/UDP protocol, the method comprising the steps of: (a) a detection device sends continuously at least one Modbus request to a slave device at a same time and records requests sent time; (b) the slave device receives the at least one Modbus request and send back a response to each Modbus request; (c) the detection device receives every response individually from the slave device and records its received time; (d) the detection device calculates the response time-out of the slave device for each of the at least one Modbus request from the detection device; and (e) the detection device calculates the precise response time-out from a predetermined number of response time-outs which are gotten from said slave device responses to said Modbus requests.