IDENT-M System V • TCP/IP connection
Communication: Control interface unit <==> TCP/IP
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Communication: Control interface unit
<==>
<==>
<==>
<==>
TCP/IP
As soon as a command has been received from a TCP/IP client, it is immediately sent
back to acknowledge receipt.
In the normal case, the return response consists in the first three bytes of exactly the
content of the command that was sent. A deviation is present if a command has al-
ready been processed at the time of reception. In this case, the command that is ac-
tive at the time is sent back with the message Command active.
After processing of a command, the answer is sent.
The previously sent parameters and the command are repeated as confirmation in
byte 0, byte 1 and byte 2.
Byte 3 contains status information about the command that was executed or the one
that is currently active.
Byte 4 indicates the processing of a command through an increase in the execution
counter. In addition, existing communication and a confirmation for the command are
indicated by the high-order bits.
Bits 4 and 5 show the switching state of the sensors connected to input Port 0 or 1.
These sensors serve as trigger signals for the two commands 'automatic read‘ or 'au-
tomatic write‘.
Table 9.1:
Designation
Bit number
7
6
5
4
3
2
1
0
Byte 0
X4
X3
X2
X1
K3
K2
K1
-
Byte 1
Command Character 1 identifier
Byte 2
Command Character 2 identifier
Byte 3
Status
Byte 4
I1
T1
S2
S1
EC4
EC3
EC2
EC1
Byte 5
Data
Byte 6
Data
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
- „ -
Byte n
- „ -
