Ethernet Parameters:Number of ports: 1 Interface standard: RJ45 interface LAN Ethernet: 10 / 100Mbps Data cache: 6K bytes Protection: 2KV electromagnetic isolation Network protocols: IP, , , UDP, ICMP, IGMP, DCHP and so on Serial Port Parameters: Number of ports: 1 Interface standard: TTL serial port, 2.54MM pin, 3.3V or 5V level Baud rate: 300 ~ 921600bps Data bits: 5,6,7,8,9 Stop bit: 1,2 bit Parity: no parity, odd parity, even parity Flow Control: None Cache: 2K bytes Supporting Software: Parameter configuration: network configuration software, serial AT Module testing: test software (network, serial one) Basic Parameters: Working voltage DC3.3V / 5V Operating current 200mA @ 5V Pin 1. RESET: Factory reset pin, the module power-on detection, active low 2. DIR: RS485 receive, send switch control pin 3. TCPCS: client mode, the port connection status indicator pin, the connection is successful output low 4. RUN: module running status indication pin, input 2Hz square wave 5. GND: Power Ground Pin 6. 3.3V: 3.3V DC power input pin, 200mA, and 5V DC power supply alternatively 7. GND: Power Ground Pin 8. 5V: 5V DC power input pin, 200mA, and 3.3V DC power supply can choose one of two Colour:blue+silver Material:plastic+metal Package Contents: 2 x CH9121 Serial Port to Ethernet Network Module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.