Commissioning
ZDUE-LTE-PLUS-VII
Page 17 of 62
3.2 Connect meter
The ZDUE-LTE-PLUS-VII has the meter interfaces listed below. Connect the
meters to the terminal block according to the following illustrations. All
interfaces can be used simultaneously.
CL1 interface
This
20mA current interface
(current
loop) is used to connect meters with
current interface according to EN 62056-
21.
About 4 meters can be connected to this
interface.
Further information:
→
Page 21
ZDUE
Meter 1
CL1+
Meter 2
Meter n
CL1-
RS-232 interface
It is used to connect a meter with an
interface according to V.24/V.28.
A maximum of 1 meter can be connected
to this interface.
Further information:
→
Page 22
ZDUE
Meter 1
TX
RX
DSR
GND
RS-485 interface (2-wire)
It is used to connect meters with RS-485
interface.
A maximum of 32 transceivers (meters)
can be operated on the bus.
The bus connection is terminated to
Z=120 Ω (nominal) (RT+ to RT-) and the
cable length is limited to 1000m.
The interface is electrically isolated from
the mains connection.
Further information:
→
Page 21
ZDUE
Meter 1
Meter 2
Meter n
RT-
RT+
3.3 Connecting the ZDUE-LTE-PLUS-VII to the supply voltage
The connection to the supply voltage is made via the terminals L and N of
the terminal block. These terminals are designed for cables with a cross-
section of up to 1.5 mm².
L
N
HS-
HS+ RTX- RTX+
RT-
RT+
RJ45
