Rs485 Communication Module; Pulse Input Function Module - Diehl Metering 548 Manual De Instalación

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7.2.4 RS485 Communication module

The RS485 communication module is a serial interface for communication
with external devices, e.g. PC; 2400 bauds.
The module contains a 4-pole
terminal strip with terminals
marked D+, D-, +12 V and
GND. The module requires
an external supply voltage of
12 VDC ±5 V.

7.3 Pulse input function module

Module for two additional meters
Pulse input 1 is marked as "I1- ", input 2 with "I2 - ".
Pulse inputs can be programmed (IZAR@SET) with a value: 1, 2.5, 10, 25,
100, 250, 1000, 2500 litre per pulse.
ƒ
Pulse transmitter must be electrically isolated, e.g. Reed contact
ƒ
Possible units are all the energy units available in the meter, the vol-
ume unit m³ or no unit.
Input frequency
Min. pulse duration
Input resistance
Terminal voltage
Cable length
Data is accumulated separately
in registers; can be read in the
display as IN1 and IN2 and can
be transferred via the commu-
nication facility.
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≤ 8 Hz
10 ms
2.2 MΩ
3 VDC
to 10 m
-29-