07-11-2014, 10:26 AM
Abstracts: Gateway is an HART to RS-485 converter specially designed as the master device of HART protocol. The HART device here is a pressure transmitter. When connecting gateway to PC via RS-485, it will allow users to access the HART devices via COM-port of PC. Therefore, users can make data collection and processing of HART network easier and quicker by applying gateway. The utility model relates to a field communication converter, which is in conformity with an HART host machine agreement and can realize the conversion of an RS-485 interface and a communication interface of the HART agreement. The utility model comprises a HART modem, two microcontrollers and a RS- 485 chip. The input to the modem is Smar Pressure Transmitter 1151 connected at HART_IN input pin. Here Intertfacing of Hart modem and microcontroller ADuC7060 is done via UART, which is interfaced to another microcontroller CY8C27443 via I2C. This CY8C27443 is interfaced to Max-485 via UART. Then Max-485 converts the TTL level signal to RS-485 level signal which interfaceable with PC. Thus Gateway from software and hardware ensures the conversion between the RS-485 interface and the communication interface of the HART agreement, and functionally realizes HART communication to a field meter through the RS-485 interface of a PC.