Besides there is also some alternatives such as an inductance conversion using differential transformer and space curve deformeter and variable resistance pressure transmitter.
除此之外还有利用差动变压器和扰曲线应变计的电感变换方式，以及变电阻式压力变送器。
2
HART field-bus protocol is used in output of system pressure or differential pressure transmitter, digital signals is transmitted with MODBUS via RS485.