FLM WJ-VD15 data transmission channel surge protector is designed according to relevant railway standards and meets the requirements of the TB/T2311-2017 standard. It is a fine protector for serial ports that can be directly inserted into the serial port when used. At the same time, it can be used for ISDN phone protection. It is widely applied to transient overvoltage protection of RS 232C serial ports of computers, control systems, printers, etc. It can provide multiple interface types. FLM WJ-VD15 data transmission channel surge protector is used for fine protection of BD9-pin RS-232, RS422 and RS485 interfaces.