USR-N540 User Manual www.usriot.com
Jinan USR IOT Technology Limited 40 / 73 inquiry@usriot.com
3.7. Value-added Functions
3.7.1. DHCP
DHCP is obtaining IP address automatically. USR-N540 IP obtaining have 2 types: DHCP and static IP. It is static
IP192.168.0.7 by default.
DHCP is effective after change to DHCP and restart. When USR-N540 connects to router or device assigning IP, it
require IP address from host within network, which takes about 5-15 seconds.Then you can search N540’s IP address. It
is convenient for setting different IP address in different environment.
<Notes> Don’t set DHCP when USR-N540 connected to PC directly because generally PC don't have the ability of
assigning IP. Otherwise, USR-N540 cannot transmit data normally, but wait for IP.
3.7.2. DNS
USR-N540 access the domain name or dynamic domain name when work under Client mode. The length of domain
name must be less than 30 bytes .USR-N540 will analysis the domain name constantly if cannot connect to destination
server.
When server’s IP address is dynamics, DNS make USR-N540 ’ parameter no changes if according IP doesn't change
no matter how server IP address changes.
3.7.3. Heartbeat Package Function
Heartbeat packet is divided into network heartbeat and serial port heartbeat. It can send heartbeat packet to serial port
or to network.
Serial heartbeat packet: It can be sent to the serial port as a fixed query command
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