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Service Guide
RS485 communication module
The RS485 communication module is a serial interface for communication
with external devices, e.g. PC.
The module contains a 4-pole terminal strip with terminals marked D+, D-
und +12-. The module needs an external power supply of 12 V DC ±5 V.
Pulse input function module
Module for two additional pulse counters. The module contains a 4-pole
terminal strip with pulse input 1 marked as "I1 - |_" and input 2 as "I2 - |_".
▪ Pulse inputs 1 and 2 are programmable for a value of: 1, 2.5, 10, 25,
100, 250, 1000, 2500 litres per pulse.
▪ Possible units are all the energy units available in the meter, the vol-
ume unit m³ or no unit
▪ Input frequency is in the range < 8 Hz.
Min. pulse duration 10 ms.
▪ Input resistance 2.2 MΩ.
Terminal voltage 3 V DC.
▪ Data is accumulated separately in registers
▪ Data is readable as IN1 and IN2 in the display and can be transmitted
over the communication modules
▪ Cable length up to 10 m
Pulse output function module
The module contains connections for 2 pulse outputs, , proportional to the
flow or heat consumption. The module contains a 4-pole terminal strip with
pulse input 1 marked as "O1 - |_" and input 2 as "O2 - |_".
External supply: Vcc = 3-30 V DC
Output current < 20 mA with a residual voltage of < 0.5 V Open collector
(drain) Electrically isolated Output 1: f < 4 Hz
Pulse duration: 125 ms ±10 %
Pulse break: > 125 ms –10 %
Output 1:
▪ Output frequency: f < 4 Hz
▪ Pulse duration: 125 ms ±10 %
▪ Pulse break: > 125 ms –10 %
Output 2:
▪ Output frequency: f < 100 Hz
▪ Pulse duration
▪ Pulse break ~1:1
▪ Volume pulse value is programmable as desired
10
HDU-SF (Horizontal Distribution Units - Single Flat)
VIIGB102
Energy
external
meter
V
cc
Pulse
Pulse
output
module
GND
Danfoss Heating Solutions
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