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Chengdu Ebyte Electronic Technology Co.,Ltd.
E90-DTU(433L30E)-V8 User Manual
Device fixed port (factory default: 8886), TCP server mode device listens to the configured port, accepts client
connection requests and establishes a connection for data communication, TCP client mode device fixed port
initiates connection requests.
4.3.3. Subnet Mask and Gateway Configuration
The subnet mask is mainly used to determine the network number and host number of the IP address, to indicate the
number of subnets, and to determine whether the module is in the subnet.
The subnet mask must be set. Our commonly used class C subnet mask: 255.255.255.0, the network number is the
first 24 bits, the host number is the last 8 bits, the number of subnets is 255, and the module IP is in the range of
255 within this subnet, the module IP is considered to be in this subnet.
Gateway refers to the network number of the network where the current IP address of the module is located. If a
device such as a router is connected to the external network, the gateway is the router.
4.3.4. Domain Name Resolution (DNS)
Domain name resolution translates domain names into network-recognized IP addresses through Domain Name
Resolution (DNS) servers. The domain name resolution (DNS) server address of this product supports user-defined,
and can realize domain name resolution through a custom domain name resolution server in the event of an
abnormal domain name server. The device will report the resolution to the custom domain name resolution (DNS)
server during domain name resolution. Request, return the device connection parameters (usually the IP address)
after the parsing is completed.
In DHCP mode, the domain name resolution (DNS) server address is automatically obtained (synchronized with
the router's domain name resolution address) and cannot be customized.
In static IP mode, the factory default address of the domain name resolution (DNS) server is 114.114.114.114,
which can be customized by the user.
4.3.5. Target IP/Domain Name
The target IP parameter can automatically identify whether the configuration parameter is an IP address or a
domain name input, and the domain name input supports a maximum of 128 characters for configuration.
4.4. SOCKET function
4.4.1. TCP Server
TCP Server is the TCP server. In TCP Server mode, the device listens to the local port, accepts the client's
connection request and establishes a connection for data communication. When the Modbus gateway function is
disabled, the device sends the data received by the serial port to all client devices that establish connections with
the device, and supports up to 6 clients. After the Modbus gateway function is enabled, the non-Modbus data will
be cleared and not forwarded.
Typically used for communication with TCP clients within a local area network.
The connection request is no longer accepted after more than 6 clients, and the web page configuration cannot be
used when the 6 clients remain connected.
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