TC 57 settings:
The advantage of the TC 57 settings is that on reception of a frame of this format
(from the RS232 line) the frame is immediately sent on to the Ethernet without
having to wait for a timeout. This greatly improves communication speed and
e formats
for the link layer. They are:
Format FT 3
xed
ariable length for FT 2 and FT 3 have a header of fixed length.
es for “Fixed frame
nd “Header length” parameters.
. This value only relates to the
See IEC 60870-5-1 IEC 60870-5-2
performance.
The IEC 60870-5-1 and IEC 60870-5-2 norms define four standard fram
• Format FT 1.1
• Format FT 1.2
• Format FT 2
•
The transmission frame formats - FT 1.2, FT 2 and FT 3 have a Frame of fi
length.
The Frame with v
It includes “Start character”, “Length” byte, “User Data” and “Check sequence”.
The user must select the desired Format and include valu
length” a
The range of “Fixed frame length” is from 2 to 255 bytes.
The range of “Header length” is from 2 to 14 bytes
“user data” from the header.
Änderungen vorbehalten Stand 09.09.05
ipcas GmbH ipEther232 V11.01 Seite 58 von 150
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