5-4SectionSending Commands From a Host Computer
79
In this example, the host computer and the remote node (Ethernet Unit) are on
the same network. The communications parameters specified from the host
computer would be as follows:
Destination IP Address: 196.36.32.100 (Ethernet Unit of remote node)
UDP port number: FINS UDP port No. (Ethernet Unit of remote node)
FINS addresses (Remote node CPU Unit):
Network number: 1
Node number: 100
Unit number: 0
FINS addresses (Host computer):
Network number: 1
Node number: 50
Unit number: 0
Host computer
IP address: 196.36.32.50
FINS network/node/unit: 1/50/0 (Hex)
Remote node
IP address: 196.36.32.100
FINS network/node/unit: 1/100/0 (Hex)
Ethernet
In this example, the host computer and the remote node (Ethernet Unit) are on
different networks, connected by a relay node. The communications parameters
specified from the host computer would be as follows:
Destination IP Address: 196.36.32.100 (Ethernet Unit of relay node)
UDP port number: FINS UDP port number (Ethernet Unit of relay node)
FINS addresses (Remote node CPU Unit):
Network number: 2
Node number: 1
Unit number: 0
FINS addresses (Host computer):
Network number: 1
Node number: 50
Unit number: 0
Host computer
IP address: 196.36.32.50
FINS network/node/unit: 1/50/0 hex)
Relay node
IP address: 196.36.32.100
Remote node
FINS network/node/unit: 2/1/0 (Hex)
Ethernet Unit
Controller Link
Ethernet Controller Link Unit
5-4-2 FINS Frames
The FINS communications service is carried out through the exchange of FINS
command frames and their corresponding response frames. (There are also
commands with no responses.)
Both command frames and response frames are comprised of a FINS header
for storing transfer control information, a FINS command field for storing a com-
mand, and a FINS parameter/data field for storing command parameters and
transmission/response data.
Example 1: Intranetwork
Addressing
Example 2: Internetwork
Addressing
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