Chapter 9 Ethernet Communication Module AH10/15EN
9-25
IP address
An IP address is the address of a device on a network. Every device connected to a network
needs an IP address. If a wrong IP address is used, the device can not connect to a network,
even other devices can not connect to the network. Please contact a network administrator to
get more information about assigning an IP address. The default IP address of AH10/15EN-5A
is 192.168.0.5.
Subnet mask
A subnet mask is an important parameter for setting a subnet, and is used to judge whether the
IP address of a destination device and the IP address of a local device are in the same subnet. If
the IP address of a destination device and the IP address of a local device are not in the same
subnet, the local device will send a packet to a gateway, and the gateway will send the packet to
another subnet. If the setting is incorrect, a destination device can not communicate with
AH10/15EN-5A normally. Users can judge whether the IP address of a destination device and
the IP address of a local device are in the same subnet by performing a bitwise AND operation
between the IP address of the local device and the subnet mask, and a bitwise AND operation
between the IP address of the destination device and the subnet mask. If the two values are the
same, the IP address of the destination device and the IP address of the local device are in the
same subnet. The default subnet mask of AH10/15EN-5A is 255.255.255.0.
Default gateway
A gateway is a network point that acts as an entrance to another network. For example, in order
to connect a local area network and a wide area network, a gateway is needed. The IP address
that a gateway uses and the IP address of AH10/15EN-5A must be in the same subnet. The
default gateway of AH10/15EN-5A is 192.168.1.1.
IP filter
AH10/15EN-5A provides a firewall service, and adopts an IP filter. To prevent errors from
occurring, an IP filter is used to limit network connections. Only devices whose IP addresses are
within the range set by users can connect to AH10/15EN-5A, and other devices whose IP
addresses are not within the range can not connect to AH10/15EN-5A. After the IP filter function
is enabled, IP addresses are filtered according to data which are set.
TCP keepalive period
The TCP keepalive period by default is set to 30 seconds.
9.4.2 HWCONFIG─Function List
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