Manual 7XV5655-0BB00
SIEMENS AG
Page 61 of 79
C53000-G1176-C175-3
S39 Select TC57 Type
Range
0 ... 3
Default
1
The IEC 60870–5–1 and IEC 60870–5–2 standards define four standard frame formats
for the data link layer:
0 = Format FT 1.1 2 = Format FT 2
1 = Format FT 1.2 3 = Format FT 3
Frame formats FT 1.2, FT 2 and FT 3 have a frame of fixed length.
The frame with variable length for FT 2 and FT 3 has a header of fixed length. This
contains "Start character", "Length", "User data" and "Checksum".
The user must select the required format and enter the values for "Fixed frame length"
and "User data length".
S40 TC57 Fixed Frame Length
Range
2 ... 255
Default
2
The value in the "Fixed frame length" edit box is in the range 2 to 255 bytes.
S41 TC57 User data length
Range
2 ... 255
Default
2
The value in the "User data length" edit box is in the range 2 to 14 bytes. The value only
refers to "User data" from the header.
S81 Password Protection
Range
0 ... 1
Default
0
Register 81 activates and deactivates password protection.
Changes are only possible in password configuration mode (see ATP).
The default value is 0 (password protection inactive).
If password protection has been activated, the modem will exhibit the following
behaviour:
After dial-up the modem outputs the message "PASSWORD:". The user has three tries
at entering the password correctly. Then the modem is blocked for a definable time (see
S82).
Incorrect password entries are counted (in the RAM only) ATS83.
DCD is only activated in the remote modem after successful password entry. After three
incorrect password entries, the remote modem goes on-hook without any call-back. "NO
CARRIER" appears.
