OX-321 optoelectronic isolation repeater, compatible with RS-485 standard, can extend the communication distance of RS-485 bus network, increase the number of RS-485 network devices, built-in optoelectronic isolator and DC/DC isolation module, can provide up to 2500Vrms isolation voltage, and the interface is equipped with fast transient voltage suppression protectors at both ends. This protector is designed to protect the RS-485 interface