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This paper puts forward a kind of isolated protocol converter which applied to the temperature and pressure compensation system of pressure transmitter.Its purpose is to replace the existing parallel temperature and pressure compensation system based on HART bus[1],which simplifies the compensation circuit, improves the communication rate between master station and location acquisition boards , makes the maintenance and repair of the system simple, and make the PCI bus driver control PIO digital I/O circuit[2] complete independence,which only used for gas path switching selection control of temperature and pressure compensation.Isolated protocol converter which is a standalone module by independent research and self-proposed protocolis,it is application and verification by pressure transmitter,the developmental achievement is able to solve the problems of the current temperature and pressure compensation system ,while it is easy to transplant to other temperature and pressure compensation system,and meet the demand of pressure transmitter production .