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IDENT-M System V • TCP/IP connection
Working principle of the communication sequence
Zumutbare Änderungen aufgrund technischer Verbesserungen vorbehalten.
Copyright Fuchs, Printed in Germany
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Working principle of the communication sequence
The Control interface unit for TCP/IP MVI-F57-2HB12 is designed as a server. This
means that each function must be initiated by a command that is sent from the "client".
In principle, 3 cases must be distinguished for communication between client and
server:
1. A command that requires processing
2. A command that does not require any processing
3. A command that is sent from the client to the server during current command
processing.
on 1.)
If a command is sent from a client to the server, the command will be acknowledged
immediately. This confirmation telegram is identified by the fact that the command re-
sponse flag T1 (See page 23) is set to "1". In addition, the flag I1, Command active,
is also set to "1".
T1 = "1" indicates that the command has been received correctly.
I1 = "1" indicates that the command has been executed (is activated).
After the command has been processed, the server
automatically
sends the request-
ed data. This response is identified by the fact that T1 ="0" and
I1 = "0". This indicates that (T1 = "0"), that the transfer involves requested data and
not
the confirmation of a command. I1 = "0" indicates that the Control Interface unit
is ready to receive new commands.
Graphically displayed, the processing appears as follows:
The response is only valid if the status received in the response tele-
gram is NULL. If the status is different than NULL, the message in que-
stion is an error message.
TCP client
MVI-F57-2HB12
Command
Command processing
Confirmation
T1 = "1"
I1 = "1"
Status == NULL
Confirmation
T1 = "0"
I1 = "0"
Status == NULL