infraredlinegas sensorThere are two types of signal outputs: analog 4-20mA output andRS-485dataBus output. The 500 model only has one 4-20mA output. The output signal is a 4-20mA linear analog signal related to the detection range. This signal is compatible with 10 series and 12 series multi module controllers,Programmable Logic ControllerAnd compatible with other standard data acquisition devices. There are two other functions for analog output. When entering the calibration menu, the 4-20mA signal will drop to 2mA. This low current will remain until the sensor returns to normal operation. Secondly, once an error occurs, the 4-20mA signal will drop to 0mA, and this condition will remain until the error state returns to normal. The changes in these output signals can be used by external devices to identify and record the working status of the sensors.

RS-485data communicationThe Modbus RTU protocol is used in China, which is compatible with almost all other protocolsofProgrammable Logic ControllerCompatibility with human-machine interface software and other control systems. Because Modbus RTU protocol is a standard. fromRS-485The communication interface can obtain the following information: detector readings, detector alarm points, calibration mode, detector errors, status of two alarms, and calibration program errors. The address of RS-485 can be changed by a dual in-line package switch. The communication is a two-wire, half duplex system with a detector as its servo device. In theory, the main controller can simultaneously control 256 different detectors at a distance of 4000 feet.