[Introduction]：NA111-M is a serial port server that realizes serial port data ⇌ Ethernet data conversion; it has multiple Modbus gateway modes and MQTT/HTTP IoT gateway modes, which can meet the networking functions of various serial port devices/PLCs; it adopts industrial-grade design standards to ensure equipment reliability; the product has a built-in RJ45 interface, and the RS485 port uses a 3×2.54mm plug-in Phoenix head spring terminal. The product can be installed using a guide rail or a positioning hole.