Delta Electronics RTU-EN01 Manual do Utilizador descarregar pdf (Página 33)

Ethernet Communication Module DVPEN01-SL

5.9 IP Filter

An IP filter is used for restricting the connection of the network in case some uncertain IP addresses will cause errors.

Only the IP addresses set within a certain range can establish a connection. Other IP addresses will be rejected.

 Setting an IP filter

1. Enable IP Filter

Check the box to enable IP filter.

2. IP Address

IP addresses that are allowed to establish connections. Maximum 8 IP addresses are allowed.

3. Subnet Netmask

The subnet of the IP adrress is allowed to establish a connection. To see whether the destination IP address

is allowed, conduct bitwise AND operations between the allowed IP address and subnet mask and

destination IP address and subnet mask. If the two values obtained are the same, the destination IP

address is allowed by the IP filter. For example, assume the IP address is 192.168.0.1 and subnet mask

255.255.255.255, the only one IP address allowed to establish a connection is 192.168.0.1. If the subnet

mask is 255.255.255.0, the IP addresses s allowed to establish connections will become

192.168.0.0~192.168.0.255.

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Delta Electronics RTU-EN01 Manual do Utilizador Página 33