7-2
Section
Routing Tables
107
•
Computer Bridges and Gateways: FinsGateway automatically implements the
bridge or gateway functionality. It does not need to be programmed by the user.
The FinsGateway, however, does not connect all networks. Refer to the Fins-
Gateway online help for details.
Computer
FinsGateway
Controller Link
Support Board
Controller Link
Controller Link
Controller Link
Support Board
•
Communications across bridges or gateways can include up to three net-
works, including the local network (data generating network).
Network 1 (local network)
Network 2
Network 3
Although 2,012 bytes of data (including the header) can be sent and received
with a Controller Link, the maximum amount of data is limited by any network the
data passes through, i.e., the network with the the smallest capacity will deter-
mine the limit.
If, for example, data passes through a SYSMAC LINK network as shown in the
figure, the amount of data sent and received from the Controller Link is limited to
552 bytes (including the header) because the SYSMAC LINK Network can only
handle that many bytes.
See the manual for the network you are using in order to determine the maxi-
mum amount of data for each network.
7-2
Routing Tables
Routing tables that define the communications path from the Controller Link Unit
on the local PC to the network connected to the destination PC must be created
in order to send and receive data across networks.
Creating Routing Tables
Routing tables consists of a local network table and a relay network table.
The local network table lists the unit numbers and corresponding network ad-
dresses for the Controller Link Unit and Support Board unit numbers. With the
Support Board, only one entry can be set in the table.
Unit number 04
Unit number 05
Unit number 06
Network address 1
Network address 2
Network address 3
Network address 4
Example
Local network table
Local network
address
Unit number
2
05
3
06
4
07
1
04
Unit number 07
Local network address Unit number
Local Network Table
