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ATTENTION! CONNECTING THE INCORRECTLY SET DEVICE TO THE DATA TRANSMITTING NETWORK
CAN INFLUENCE THE COMMUNICATION BETWEEN THE OTHER DEVICES. CONNECTION OF DEVICE EM-481
TO ETHERNET NETWORK NEEDS MUTUAL PARITY OF CONNECTED DEVICES SETTINGS. AS A RULE, ALL
CONNECTIONS TO THE NETWORK LINKING MORE THAN 2 DEVICES, SHOULD BE MADE BY QUALIFIED
PERSONAL (NETWORK ADMIN).
1. IP-addressing
When units are communicating over Ethernet network using TCP/IP protocol, every unit is using a set of IP-
addressing settings to identify the sender and receiver of the data. The unit memory contains the personal and
unique, within a single subnet, IP-address (four bytes are written as four integers, separated by dots, in the range of
0-255), subnet mask, which is the same for all units within the subnet (written similar to IP-address), and IP-address
of the gateway, which is used to communicate with other networks. Proper communication between units of a
subnet is possible under several conditions:
1) All units of a subnet have similar to mask. Most of small LANs are using 255.255.255.0 mask.
2) Mask starts with a group of bits set to "1", followed by a group of bits turned to "0".
3) All bits set to "1" in the mask are similar to for all the IP-addresses of units in subnet and indicate the subnet
address. 192.168 is most frequently used address in LANs for the mask 255.255.255.0. The third byte may be used
as a subnet number in a complex LAN. In smaller LANs, the third byte is usually equal to "0".
4) A set of bits in IP-address of the unit, which is set to "0" in the mask, is unique to each unit within the same subnet.
5) In most cases, the unit like router, which is already communicating with other networks, is switched to the network.
This unit often gets the following address 192.168.0.1, 192.168.0.100, or 192.168.0.101. In this case, other units in the
network shall have this IP-address of the unit as the gateway address. This address is not necessary for communication
between units in a subnet, and is only used to connect units of one subnet to units of other networks.
Factory addressing settings for EM-481 are listed in Table B.1.
With the factory settings of the EM-481, two ways are possible for communicating with it via Ethernet:
a) The network uses a router or other DHCP server, which assigns IP addresses to new devices. In this case, it
is sufficient to connect the EM-481 to the network, and after some time the obtained IP address is appeared on the
display. The address "0.0.0.0" means that the desired value has not been received yet. The address is
"192.168.0.111", obtained after 20-60 seconds after running EM-481, may mean that getting address from the
DHCP server is failed and the device uses a static address;
b) The network is not able to use DHCP, or EM-481 is connected directly to the computer (or other device-client on
the same subnet). In this case, EM-481 will switch to static addressing after some time (20-60 seconds) after starting. A
client device should use a mask 255.255.255.0 as a mask and address starting with 192.168.0. The fourth byte of the
address can take any value in the range from 1 to 254, except for 111. If the connection between EM-481 and a client
unit is not provided directly but via a network with a number of units, the mentioned address cannot be equal to any of
the addresses of other units on the subnet. If network has several units with the mask and the first three bytes of the IP-
address, which are different from those specified in Table B.1, or the EM-481 factory IP-address is already taken, the
configurable unit should be temporarily removed from the network to avoid addressing conflicts and establish a
communication between this unit and EM-4816 directly. This will allow configuring the unit and EM-481 for direct
communication or switching EM-481 to the network.
2. Configuring the client device to connect via Ethernet
The unit addressing is set according to documents and software it uses.
Below is an example of configuring the personal computer (PC) with Windows XP/7/8/10 to communicate directly
with the EM-481 using factory settings.
Open the list of OS network connections to configure the network address in Windows. To do this, follow the
steps below (mind the OS version).
For OS of Windows XP:
1) Log in as administrator;
2) Select Start-Control Panel;
3) If control panel items are divided into categories, select "Network and Internet Connections";
4) Go to "Network Connections".
EM-481
(recommended)
Table B.1 – Factory addressing settings for EM-481
Parameter
Addressing using DHCP
IP-address
Subnet mask
Gateway
24
-
-
Appendix B
Connections
Value
192.168.0.111
255.255.255.0
192.168.0.1
Yes
NOVATEK-ELECTRO
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