Baer DLX User Manual page 115

1 SCTM Protocol
The following sections describe the data format of telegrams during com-
munication using the SCTM protocol (Serial Coded Telemetering). The fol-
lowing conditions have to be observed:
•
transmission settings: 7 (bits), e (even parity), 1 (stop bit)
•
the substation address (US-Number) has 5 digits (can be programmed us-
ing DLXPARA) or 8 digits (from version 1.04.01 and up)
•
no point-to-point connection is possible without substation address
•
the length of the header is constant: 14 (or 17) bytes
•
broadcast commands and priority telegrams are not supported
•
a maximum of two registration periods (MP1/Tm1 and MP2/Tm2) is sup-
ported
The following data can be retrieved:
•
load profile data from registration period buffers (PP-01 for MP1 and PP-02
for MP2) with a maximum of 16 channels (demand, energy values or in-
crements/energy feed) per buffer and registration period
•
spontaneous event data, including alarm messages, status messages and
parameter changes
•
table data (addresses between 000-00 and 999-99)
1.1 Device status in the registration period data block
The DLX stores the device status for each completed registration period;
this data contains general information about the unit for that period. It con-
sists of 4 ASCII characters, representing 2 bytes (2 characters per byte).
Each character is coded in the hexadecimal system and contains 4 bits.
The following table describes the relations between the hexadecimal nota-
tion and the binary notation:
Hex Binary
0 0000
1 0001
2 0010
3 0011
In the DLX unit the device status is contained in 2 bytes:
Byte 1
Character 1
T-Bit U-Bit M-Bit A-Bit S-Bit
Hex Binary
4 0100
5 0101
6 0110
7 0111
Character 2
0 NP-Bit
Hex Binary
8 1000
9 1001
A 1010
B 1011
Character 3
L-Bit 0 1 0
Hex Binary
C 1100
D 1101
E 1110
F 1111
Byte 2
Character 4
0 0 0 0 0
A 5