1. 1
3
2
4
6
7
5

2. 1. Application
layer)
OSI
Header)

3. 2. Presention
layer)
Text)

4. 3. Session Layer)
Header)

5. 4. Transport Layer)
Host-to-Host)
End-to-End)
Checksum)

6. 5. Network Layer)
-

7. 6. Data Link
Layer)
Checksum)

8. 7. Physical Layer)
-
RS-232-C
Pin)