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Software Configuration Section 1-6
1-6 Software Configuration
The software supported by the Ethernet Unit runs in the layers shown in the
following diagram. The components that form the various layers are defined
below the diagram.
Ethernet The Version-2.0 Ethernet frame format is used for communications.
IP Internet Protocol: Transfers datagrams to target nodes using IP addresses.
ICMP Internet Control Message Protocol: Supports IP communications by signalling
errors in data transfers.
ARP Address Resolution Protocol: Determines the Ethernet address (i.e., physical
address) by broadcasting based on the target IP address.
UDP User Datagram Protocol: Performs datagram communications. Data resends,
priority control, flow control, and other measures to ensure communications
reliability are not performed for UDP communications, i.e., there is no way of
guaranteeing normal communications without programming special measures
to do so into the user’s application program.
TCP Transmission Control Protocol: Performs communications after establishing a
connection (i.e., a virtual circuit) with the target node to provide a highly reli-
able communications method.
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31
UNIT
No.
RUN
ETN11
ERC SD RD
ERH TCP FTP TS
90 2.72.7
ETHERNET
NODE
No.
x16
1
x16
0
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
0
1
2
3
4
5
6
7
8
9
A
B
C
D
E
F
CJ1W-ETN11
(Unit: mm)
CS/CJ-series PC's CPU
Memory Card/
EM File Memory
FINS
FTP server
UDP
TCP
IP
Ethernet (V2.0)
ICMP ARP
FINS Communication
Service
Socket
Services
CS/CJ-series PC's CPU Uni
t
Ethernet Unit
Socket
Services
SMTP
FTP
Mail
transmissions