Module parameter configuration is divided into two parts: basic setting and port configuration, basic setting main include ,device name ,network parameter,serial port negotiation authentication function, serial port negotiation authentication function default is off status, defaulting through hardware CFG0 pin enter erial port setting mode,can through serial port negotiation enter serial port setting mode after open . CLIENT mode: On the CLIENT model ,after charge in the module, take the initiative connected SERVER terminal, when the connection is established, can achieve two-way parent mission of network data packets and serial port data , Under this mode, SERVER ?s IP need to be visible to the module,so it means via module IP can direct connect server IP . under CLIENT mode, support local serial port random,support through domain name access remote service area SERVER mode: On the SERVER mode,after charge in the module, listen to the local serial port whether have a client request connection, after the connection is established,can achieve two-way parent mission of network data packets and serial port data .under this mode, CLIENT IP need to be visible to the module,The visible meaning is that the IP of the client can be directly through the client IP UDP CLIENT mode: On the UDP CLIENT mode,after charge in the module, sent data to the local port (from the destination IP and port) parently forwarded to the module serial port.Similarly,send to module serial port data through UDP ways forwarded to set destination IP and port. Under this model, the module needs to configure network parameters there are: working mode, device IP, subnet mask, default gateway, device port. the destination IP address, destination port. UDP SERVER mode: On the UDP SERVER mode ,received d to local IP and port all data is forwarded to the serial port, send to module serial port data also through UDP way forwarded to Communicate with UDP?s IP and serial port ,Under this model, the module needs to configure network parameters there are: working mode, device IP, subnet mask, default gateway, device port. Feature: 1.Built-in and PHY 2.Support two-way parent mission 3.Support 10/100M 4.Supprot /MDIX automatic conversion 5.Support DHCP obtain an IP address automatically 6.Support DNS domain name access 7.Support CLIENT, SERVER, UDP CLIENT, UDP SERVER 8.Support KEEP ALIVE mechanism 9.Supprot UART 0~2000ms timeout setting Parameter: 1.Model: CH9121 2.Work Voltage: DC 3.3V~5V 3.UART Level: DC 3.3V~5V 4. rate: 300bps~921600bps 5.Work Temperature: -25~85 6.Work Humidity: 5%~95%RH 7.Size: 54 * 25 * 18mm Pin definition: 1.RESET: Input. Restore factory settings, chip power-on detection, low level is valid 2.RSTI: Input. External reset input low level is valid 3.DIR: Output. Use controlRS485 send and receive switching 4.: Input. Serial port configuration mode setting pin built-in pull-up, enter the serial port configuration mode when low level is detected high level quit configuration mode. color: blue Material: PCB Package Contents: 1 * CH9121 Ethernet Network Module UART to RJ45 Converter Only the above package content, other products are not included. Note: Light 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.