B&B Electronics MESR321_SL_ML - Manual - Manual (Page 26)

Setup and Connections Vlinx MESR321 Modbus Gateway
24
MESR321-xx_R001_2113m
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Figure 24. Network Settings Screen (DHCP Selected)
b. The default network configuration is to receive an IP address assignment
from a DHCP server. DHCP controls whether or not a DHCP server is
used to set the IP address, subnet mask and default gateway of the
Modbus Gateway. When DHCP option is enabled but the DHCP server is
not found, the Modbus Gateway will automatically configure IP address
169.254.102.39 with a subnet mask 255.255.0.0
c. To configure your Modbus Gateway without using a DHCP Server,
uncheck the “I want DHCP to setup the network” box. You will need to
know the IP Address, Subnet Mask, and Default Gateway.
IP Address field contains static internet protocol address of the Modbus
Gateway.
Subnet Mask field contains mask that is used to define sub network.
For Class A network (IP addresses 0.0.0.0 through 127.255.255.255), the
default subnet mask is 255.0.0.0.
For Class B network (IP addresses 128.0.0.0 through 191.255.255.255),
the default subnet mask is 255.255.0.0.
For Class C network (IP addresses 192.0.0.0 through 223.255.255.255),
the default subnet mask is 255.255.255.0.
For Class D network (IP addresses 224.0.0.0 through 239.255.255.255)
and Class E network (IP addresses 240.0.0.0 through 255.255.255.255),
the subnet mask is ignored.