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when using modbus polling function. If polling interval is too shot and baud rate is too low for the process of
polling command which might lead to conflict between command circle and polling time.
3.4. Extra functions
3.4.1. DHCP
DHCP is obtaining IP address automatically. USC520/USC540 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 USC520/USC540 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 N520’s IP address. It is convenient for setting different IP address in different environment.
<Note> Don’t set DHCP when USC520/USC540 connected to PC directly because generally PC don't have
the ability of assigning IP. Otherwise, USC520/USC540 cannot transmit data normally, but wait for IP.
3.4.2. DNS
USC520/USC540 access the domain name or dynamic domain name when work under Client mode. The
length of domain name must be less than 30 bytes .USC520/USC540 will analysis the domain name
constantly if cannot connect to destination server.
When server’s IP address is dynamics, DNS make USC520/USC540 ’ parameter no changes if
according IP doesn't change no matter how server IP address changes.
