13
The data protocols used are the M-Bus protocol (see also M-Bus
), SML (as per SML specification version 1.03) or
Modbus-RTU® (Remote Terminal Unit).
Properties
Number of connected devices
up to 32
Maximum cable length
up to 1,000 m
Data transfer rate
300...38400 baud, depending on
the protocol
Signal as per TIA/EIA-485/ITU-T
V.11
Logical “1”
–0.3 V to −6 V
Logical “0”
+0.3 V to +6 V
RS485 standard bus
An RS485 bus can be used to operate up to 31 meters and 1 modem.
The first and last devices are each terminated with a terminator be
-
tween the lines to eliminate line reflections. If a terminator is already
contained, no additional resistor is necessary on this side of the bus.
This device must be installed on the start or end of the bus.
For further functions and details, see the protocol descriptions for this
meter.
SML (Smart Message Language)
The energy meter readings can be read out as a table by means of
“SML_GetList.Request”.
It is not possible to read out the load profile.
Please see the product manual for the values that can be read
out.
Modbus-RTU
®
(Remote Terminal Unit)
Only the master is permitted to initiate a data exchange.
Every interconnection can contain only one master but up to 247 slaves.
Summary of Contents for DIZ
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