7
Communication
ID 442233.05
WE KEEP THINGS MOVING
Operation manual
34
7.2.2 Requirements for a direct connection
Note the following rule for the direct connection:
• The socket of the gateway device and the computer's network connection
must have IP addresses on the same subnet.
7.2.3 IP adress and subnet mask
An IP address is divided into a network section and a device section by the subnet
mask. The subnet mask can be represented in binary format, for example, as a
series of numbers with the left side consisting only of the number 1 and the right
side consisting only of the number 0.
1111 1111.1111 1000.0000 0000.0000 0000 = 255.248.0.0
The section of the subnet mask with the number 1 shows which part of the IP
address indicates the address of the subnet (the network section). The other part
with the number 0 shows the part of the IP address that represents the address
of the device in the subnet (device section).
The following example illustrates how to calculate the IP address.
The IP address 128.206.17.177 with subnet mask 255.240.0.0 is entered for the
network interface of the computer:
Subnet mask:1111 1111.1111 0000.0000 0000.0000 0000
The 12 numbers on the left of the IP address indicate the address of the subnet
and must be identical in the IP address of the device. The 20 number of the IP
address on the right indicate the address of the computer in the subnet. This
section must be different in the IP address of the device.
Information
To coordinate the IP addresses of the gateway device and the
computer, you have the option of changing the IP address of either
the computer or the gateway device. However, since you generally
need administrator rights to change the IP address of the computer,
we recommend changing the IP address of the gateway device.
Information
Please note that the device has two RJ45 sockets (X3A and X3B).
Since one socket must be access concretely for a direct connection,
the related parameters are created as array parameters. Element 0
contains the settings for socket X3A and element 1 for socket X3B.
Make the settings described in this section appropriately for the
socket with which you will connect the gateway device with the
computer.
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