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
performance.
The IEC 60870-5-1 and IEC 60870-5-2 norms define four standard frame formats
for the link layer. They are:
• Format FT 1.1
• Format FT 1.2
• Format FT 2
• Format FT 3
The Frame with FT 1.2, FT 2 and FT 3 have a frame of fixed length.
The Frame includes “Start character”, “Length”, “User Data” and “Check
sequence”.
The user must select the desired Format and include values for “Fixed frame
length” and “Header length” parameters.
The range of edit field “Fixed frame length” is from 2 to 255 bytes.
The range of edit field “Header length” is from 2 to 14 bytes. This value only
relates to the “user data” from the header.
SEE IEC 60870-5-1 IEC 60870-5-2
Änderungen vorbehalten Stand 09.09.05
ipcas GmbH ipEther232 V11.01 Seite 34 von 150
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