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4. Properties Vlinx MESR9xx Modbus Gateway

Page 30 Manual Documentation Number MESR9xx-0109m

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Modbus Gateway Name

Modbus Gateway Name is a unique name assigned to the Modbus gateway. It must be a

valid hostname as defined by RFC-952 and RFC-1123. The rules are:

• It must consist only of the characters "A" to "Z", "a" to "z", "0" to "9" or "-"

• It can start or end with a letter or a number, but it must not start or end with a "-".

• It must not consist of all numeric values.

Gateway Serial Port Number

The Gateway Serial Port Number of the currently selected port is shown in this field.

• MESR901-x Modbus Gateways feature one serial port.

• MESR902D-x and MESR902T-x Modbus Gateways feature two serial ports.

Subnet Mask

The Subnet Mask specifies the network mask the Modbus gateway uses when on a

subnetted network.

• For a Class A network (IP addresses 0.0.0.0 through 127.255.255.255) the default

subnet mask is 255.0.0.0.

• For a Class B network (IP addresses 128.0.0.0 through 191.255.255.255) the

default subnet mask is 255.255.0.0

• For a Class C network (IP addresses 192.0.0.0 through 233.255.255.255) the

default subnet mask is 255.255.255.0

• For a Class D network (IP addresses 224.0.0.0 through 239.255.255.255) and

Class E Networks (IP addresses 240.0.0.0 through 255.255.255.255) the subnet

mask is ignored.

• MESR9xxModbus Gateways come from the factory with a default subnet mask

value of: 255.255.255.0

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B&B Electronics ESR901 Specifiche Pagina 34