16
Specifications Section 1-4
CJ1W-ETN21
1-4-3 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.
1,2,3... 1. Ethernet (Ver. 2.0)
The Version 2.0 Ethernet frame format is used for communications.
2. IP (Internet Protocol)
Transfers datagrams to destination nodes using IP addresses.
3. ICMP (Internet Control Message Protocol)
Supports IP communications by signalling error s in data transfers.
4. ARP (Address Resolution Protocol)
Determines the Ethernet address (i.e., physical addre ss ) by br oa dcas tin g
based on the target IP address.
65
31
UNIT
No.
ETN21
90 2.72.7
100BASE-TX
10BASE-T
NODE
No.
x16
1
x16
0
(Unit: mm)
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
RUN ERC SD RD
ERH TCP FTP HOST100M
LNK
CS/CJ-series CPU Unit
FINS/UDP 8. FTP server9. SMTP
5. UDP 6. TCP
2. IP 3. ICMP 4. ARP
1. Ethernet (Ver. 2.0)
FTP
11. SMTP
Ethernet
Unit
CS/CJ-series
CPU Unit
10. POP3
7. FINS
FINS/TCP
Socket
services
FINS communi-
cation service Socket
services
E-mail
transmis-
sion
E-mail
reception
Memory Card /
EM File Memory