Chengdu Ebyte Electronic Technology Co,.Ltd E810-DTU User Manual
Copyright ©2012–2020, Chengdu Ebyte Electronic Technology Co,.Ltd
3 Network basic function introduction
3.1 IP address/Subnet mask/Gateway
1. The IP address is the identity of the module in the LAN. It is unique in the LAN and cannot be duplicated with
other devices on the LAN.
E810-DTU(RS232)-V2.0’s IP address of E810-DTU is static IP and DHCP.
(1) Static IP
Static IP requires the user to set manually
，
please note that the IP, subnet mask, and gateway should be written at the
same time. Static IP is suitable for scenarios that require IP and device statistics and have a one-to-one correspondence.
Advantage: Devices which cannot automatically assign IP addresses can be searched through the entire LAN.
Disadvantages: Different IP segments in different LANs cannot carry out normal TCP/UDP communication.
(2) DHCP
The main role of DHCP is to dynamically obtain IP address, Gateway address, DNS server address and other
information from the gateway host, eliminating the cumbersome steps of setting the IP address. It is suitable for scenarios
where there is no requirement for IP and no need for correspondence one by one of IP and modules.
Advantages: When connected routers and other devices with DHCP Server can communicate directly, and reduce
the hassles of setting up IP address gateways and subnet masks.
Disadvantages: When connected LANs without DHCP Server
，
such as computers, E810-DTU(RS232)-V2.0 cannot
work.
2. The subnet mask is mainly used to determine the LAN number and host number of the IP address, and indicate
the number of subnets, and judge whether the module is within the subnet
。
The subnet mask have to be set, what we
normally use is C type subnet mask: 255.255.255.0, LAN number is the first 24 numbers, host number is the last 8
numbers, and there are 255 subnets, If the module IP is within the 255 subnets, it is considered to be in this subnet.
3. The gateway refers to the LAN number of the LAN where the current IP address of the module is located. If a
device such as a router is connected to an external network, the gateway is the router IP address
，
If the setting is incorrect,
the external network cannot be accessed properly
，
If you do not connect a device such as a router, you do not need to set
it, by default.
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