TECHNICAL DESCRIPTION
MULTICAL
®
41
5512-313 GB/01.2010/Rev. C1
30
Reed switches with built-in protective resistances of up to 1 kOhm can be used, and both Input A and Input B
contain the necessary de-bouncing for Reed switches.
No Darlington transistors should be used when connecting transistor outputs to Input A and Input B as the
voltage level at the logical ”0” must be
<
0.5 V. In addition, the leak current in the output must be less than 1
μ
A.
The pulse inputs can be configured for most water meters.
See section 3.3.3
>FF< Input a, >GG< Input b
for information on configuration of pulse values and maximum flow
rate. Required configuration must be stated when ordering.
10.2
M-Bus, EN 1434-3, EN 13757/pulse inputs (66-0P)
M-Bus, EN 1434-3/pulse inputs (66-0S)
Figur
21
Figure
22
The M-Bus module is used for remote reading of MULTICAL
®
41 via an M-Bus network.
To make an M-Bus system work each M-Bus Slave must have a unique address. The M-Bus address is
automatically generated from the meter’s customer number at start-up, and can easily be changed by means of
the hand-held terminal MULTITERM.
The M-Bus module has 2 sets of parallel M-Bus terminals marked 24 and 25, to which the M-Bus is connected.
The M-Bus connection is independent of polarity.
The M-Bus module is galvanically separated from the meter and is supplied via the M-Bus.
Each M-Bus module has a power consumption of 1.5 mA (1 Unit Load)
The data transmission speeds are 300 or 2400 baud, and the M-Bus module has a built-in autodetection of the
baud rate.
The pulse inputs on this module are identical with the ones described earlier.
The Kamstrup M-Bus system is designed to meet the demands of the EN 1434-3 standard.
For further information, see Technical Description for Kamstrup’s M-Bus system, 5511-709.