Method of determining request transmission priority subject to request content and transmitting request subject to such request transmission priority in application of Fieldbus communication framework

A method of determining request transmission priority subject to request content and transmitting request subject to such request transmission priority in application of Fieldbus communication framework, comprising the steps of:

• (a) external requests are transmitted from a remote control end to a communication device one after another;
• (b) the communication device determines whether a specific content of each received external request corresponds to a priority right, wherein the specific content includes at least one of a request type, a destination slave device address, and a register read/write address;
• (c) the communication device determines whether there is at least one logical operation condition established;
• (d) the communication device couples the priority right and logical operation conditions of the content of each received external request subject to a user's setting to determine a transmit priority for each received external request;
• (e) the communication device transmits each received external request that does not have the priority to transmit as an ordinary request;
• and
• (f) the communication device transmits each received external request that has the priority to transmit as a priority request;
• wherein the logical operation condition to be coupled subject to the user's setting is the number of requests having the specific content on a queue.