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NOTE! CONNECTING THE INCORRECTLY SET DEVICE TO THE DATA TRANSMITTING NETWORK CAN
INFLUENCE THE COMMUNICATION BETWEEN THE OTHER DEVICES. Connection of device EM-486 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 a 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-486 Interface Converter are listed in table B.1.
Which is set to EM-486 factory settings, for communication with it via Ethernet there are 2 possible ways:
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-486 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 30-60 seconds after running EM-486, may mean that getting address from the DHCP server is failed and the product
uses a static address;
b) The network is not able to use DHCP, or EM-486 is connected directly to the computer (or other device-client on
the same subnet). In this case, EM-486 will switch to static addressing after some time (30-60 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 255, except for 111. If the connection between EM-486 and a client unit is not
provided directly but via a network with a number of units, the mentioned address can not 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-486 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-
486 directly. This will allow configuring the unit and EM-486 for direct communication or switching EM-486 to the network.
2. CONFIGURING THE CLIENT UNIT
The unit addressing is set according to documents and software it uses.
Below is an example of configuring the personal computer (PC) on Windows XP or Windows 7 to communicate
directly with the EM-486 on 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 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".
For Windows 7:
1) Log in as administrator. 2) Select Start-Control Panel.
3 )If control panel items are divided into categories, select "Network and Internet".
4) Go to "Control Center Network and Sharing Center". 5) In the task bar (on the left), select "Change adapter settings".
Next, perform the following steps:
1) In the Connections window, select the desired connection via an adapter with the addressing that you want to change.
Many computers have only one adapter and one connection, which will be displayed in this window. If the window
connections, select the connection you want, using the adapter name in the information on connection or contact your system
administrator.
EM-486
(recommended)
Table B.1 – Factory settings for EM-486 addressing
Parameter
Addressing using DHCP
IP-address
Subnet mask
Gateway
~ 32 ~
Appendix B
Connections
Value
192.168.0.111
255.255.255.0
192.168.0.1
Yes
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