ZLSN series serial port to Ethernet core module are convenient and stable solution for embedded device, single-chip, IoT sampling system access to the network based on TCP/IP protocol. Its one end is TTL electrical level serial port (also as UART), the other end can connect RJ45 Ethernet port. The serial port end need no more operation, just send data to the TTL electrical level of ZLSN so can send data to the specified network server. ZLSN series core module support configuration of multi TCP connections/DHCP/DNS/serial port, powerful and convenient to use.Shanghai ZLAN has three kinds Ethernet Core Module:
（1）Low Power Consumption：Represent by ZLSN2000, ultra-low 30mA current module.
（2）Industrial Grade: Represent by ZLSN2002, can resist all kinds EMC test (EFT, ESD), high-low temperature test, suitable to used in industrial and power industry; The ZLSN2002I is higher protection product with Ethernet port surge protection.
（3）Cost-effective: Represent by ZLSN2003S, the new generation module of minimum size, high cost-effective and full-function are suitable for smart home, IoT and such industry.
In fire alarm products, ZLSN2002I can be design in user circuit, and the serial port of 2002I connect to user microcontroller serial port, configure 2002I as TCP Client and connect it to fire alarm server, so the user microcontroller can upload alarm message.