User`s manual

http://www.adtechcn.com 107
connected to each other through crossover cable, while the device and the HUB or router can be
connected to each other through either crossover cable or straight-through cable.
5) IP address and MAC address of the device don’t exist at the time of network connection.
Use the serial-interface software tool to get (or modify) the real IP address and MAC address of
the control card, and confirm their exclusiveness in the subnet.
6) Unreliable physical connection, check
7) Error of default gateway setting. Set it correctly
8) If the problem still exists after all abovementioned solutions are used, you can power off the
control card and power on it again.
) 6. Information on network configuration
IP address: it is four-segment decimal value, two neighboring segments of which are separated
by the character “.”. The maximum value of each segment should not exceed 255, and the highest
segment should not exceed or be equal to 223 or be equal to 0. Normally, the first three
segments represent the subnet number, whereas the last segment represents the host number
within the subnet (what’s said here is based on the normal situation. There are also exceptions.)
The IP address of the control card should be within the same subnet as that of the controlling host.
If they are not in the same subnet, the value of mask should be properly adjusted (it is
recommended the control card and the host be within the same subnet).
Subnet mask: it is four-segment decimal value, two neighboring segments of which are separated
by the character “.”. The maximum value of each segment should not exceed 255. This code is
used to distinguish the dividing domain subnet number from that of the host number.
Default mask: it is four-segment decimal value, two neighboring segments of which are separated
by the character “.”. The maximum value of each segment should not exceed 255, and the highest
segment should not exceed or be equal to 223 or be equal to 0. If the real gateway exists in the
subnet, the user should fill out the IP address of the real gateway. If not, the default gateway
should be set as the first host number in the subnet, like xxx . xxx . xxx . 1.
Network adapter’s address (MAC): It is a six-segment hexadecimal value, two neighboring
segments of which are separated by the character “.”. The maximum value of each segment should
not exceed FF, and the highest segment should not be equal to 01.