The isolator has the signal conversion function and can accept DC standard (or non standard) signal, thermocouple signal, RTD signal, potentiometer signal or even AC signal. The 4-wire external powered signal isolator can provide power supply to a 2-wire transmitter, thus it avoids providing additional power supply to the transmitter, and also provides the signal isolation function. Moreover, the active signal of the 4-wire transmitter will be output to the receiving device after isolation, thus it not only avoids the power conflict, but also isolates the signal. When connecting an output loop powered signal isolator, it is powered by the receiving device through a signal output line. The signal access terminal of the receiving device is equipped with a 24V power supply, however, a 4-wire transmitter is used on site and the output signal is an active signal. Any equipment fails, it will not affect the entire loop and the other equipment. Two receiving equipments are completely isolated. Two output signals can be both identical, and different from each other. On the other hand, it can effectively remove the radio frequency and electromagnetic interference that circuits may suffer during transmission. On the one hand, the signal isolator can solve the problem of different ground reference points generated when the ground loop is connected with the equipment. Temperature: 0~50℃, humidity: ≤85%RH, far away from caustic gas In order to achieve protection, SLAVE device must be powered by other power source than MASTER device (TapHome Core and Modules).We recommend you another signal isolator ATO-SIGNI-602S, which has up to 2 input channels & 4 output channels, types of signal 4-20mA, 0-10mA, 0-20mA, 0-5V, 1-5V and 0-10V. The isolator must always be installed on the side of one of the protected devices (MASTER) - as close as possible to it. MASTER side is protected device, typically TapHome Core control unit In this case, also power source must be galvanically isolated - the easiest way is to use separate power source. This is the most common situation when when connecting TapHome modules in the garden house, or meteo station on the roof. TapHome module or other RS485 device device is connected to TapHome BUS, and the wire or device itself is outside of the lightning protection.External device is powered by other (typically its internal) power source and does not have galvanic or optical isolation.Use of optical isolator is obligatory if one of the conditions is met: Optical isolator protects TapHome control unit when connecting Modbus RTU or other RS485 bus device to it. Optical isolator supports bi-directional "half-duplex" transmission for RS485 networks.
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