HD35
- 78 -
V1.12
9.6
C
ONNECTING THE MODEL
HD35EDW-MB
WITH
RS485
M
ODBUS
-RTU
INPUT
HD35ED[L]W-MB model has:
•
7…30 Vdc power supply input (terminals 1, 2).
•
Switched power supply output (terminals 3, 4). It has the same value as the power sup-
ply input, but it is active only during the measurement acquisition phase. The out-
put can be used to power the sensors.
•
RS485 port (terminals 5, 6, 7) with Modbus-RTU protocol for the connection of the sensors.
•
Potential-free contact input (terminals 8, 9). For example, a rain gauge with contact output
can be connected.
Fig. 9.6.1: connection of HD35EDW-MB model
The jumper placed above the terminals allows inserting the termination resistance for long dis-
tance RS485 connection. Place the jumper between the RT and CLOSE indications to connect
the termination resistance. Place the short jumper between the RT and OPEN indications to
disconnect the resistance.
Note: in the HD35ED[L]W-MB model, near the connection button (CONNECT/DISCONNECT) there
are a switch (RUN/PROG) and a button (RF RESET) that are used only to update the firmware of
the instrument in the 915.9-929.7 MHz radio frequency version (option J). In normal operation,
leave the switch in RUN position.
Power supply input
7…30 Vdc
Switched
power supply output
Potential-free contact input
RS485
RS485 line termination
Summary of Contents for HD35AP series
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