A 4
Data Retrieval Protocols (AMR)
Data stored in the unit (device parameters, counter values, alarms, pa-
rameter changes, etc.) can be retrieved using either the SCTM protocol or
the IEC 60870-5-102 protocol (alternative: Modbus RTU). The communica-
tion uses a serial link (via RS232, modem, RS485, optic fiber or M-Bus)
with adjustable baud rate (300, 600, 1200, 2400, 4800 or 9600 baud) and
following transmission settings:
• 7, e, 1 for SCTM protocol
• 8, e, 1 for IEC 60870-5-102 protocol
• 8, n, 1 for Modbus RTU (alternatively to SCTM / IEC 60870-5-102; possi-
ble only at the interfaces Com1/Data and Com2/Modem)
The DLX unit automatically detects the retrieval protocol (for SCTM /
IEC 60870-5-102 only). When using the direct interfaces (service interface
or data interface) the first telegram will be lost in the case of a protocol
change ( the modem interface can change the protocol without losing a
telegram). For this reason you can use DLXPARA to define the default pro-
tocol for the data interface (the service interface always uses the IEC pro-
tocol as the default). After each parameter change or after 5 minutes with
no communication the concerned interface returns to its default protocol.
This appendix describes all the addresses available for the data re-
trieval protocols. Due to varying configurations of units it is possible
that some of them are not supported in your unit.
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