Interfaces / Options
microCLIMA
9. Interfaces and Options
9.1 Optical infrared interface
In order for a PC to be able to communicate with a
microCLIMA
instrument, it is necessary to con-
nect an optocoupler to the serial interface of the
PC. The optocoupler and the necessary software „
microCLIMA-
Monitor“ are available as options.
The optical infrared interface is activated with the
key
.
If within 60 seconds neither a valid telegram
is received nor the key pressed again, then the
interface is deactivated.
9.2 M-bus
An M-bus interface is also available as a built-in
option for the
microCLIMA
(must be stated
when ordering). Verification-relevant values and
measurement data can not be altered using this
port.
Protocol according to EN1434-3 and the M-bus
Recommendation (version 4.8 from Nov. 1997)
with the basic standard IEC 870 parts 1, 2 and 4.
Baud rate: standard: 2400 Bd.
It is important to note that the topology of the
M-bus network (lengths of connecting cables,
cable cross-sections) must correspond to the
baud rate of the terminal instruments, in this case,
the heat meters.
During communication over the M-bus with an
addressed heat meter it is not possible to use the
other instrument interfaces (the key, optical inter-
face), and vice versa.
Note: The heat meters are supplied by a battery,
for this reason the number of requests for each
instrument is limited:
In a maximum-sized M-bus network of 250 slaves
(heat meters), 24 requests per day are possible
for each meter. If fewer requests are made and/or
fewer heat meters are connected to the bus, the
unused amount of available requests are stored in
the instrument.
The lifetime of the battery depends on the amount
of communication carried out, but at the baud rate
set at the factory, the lifetime is at least 6 years
plus one year storage.
9.3 Contact output (potential-free)
The potential-free contact available as a built-
in option (state when ordering) is an electronic
switch for flexible use (class A0 according to
EN1434), which outputs the counting pulses of
the heat meter. The pulse output closes, corre-
sponding to the pulse value of the flow sensor
(see the identification plate on the instrument)
for a duration of 125 ms. If several pulses are
output during a measurement, the interval be-
tween two pulses is likewise 125 ms. As long
as the nominal and boundary values of the
contact are taken into consideration, the user is
free to define his contact data within a wide
range. A wide variety of data acquisition in-
struments can be connected to the contact
outputs.
The lifetime of the battery for heat meters with
potential-free contact outputs is at least 6 years
plus one year storage.
Pulse values:
• Heat: standard: 1kWh/pulse, or optionally
• Volume: standard: 100 l/pulse
Technical data:
Max. switching current
300mA∼/-
Max. switching voltage
35 V∼/-
Max. switching power
300 mW
Insulation resistance > 10
09
Ohm
Contact resistance max. 25 Ohm
Contact capacity max. 1.5 pF
Maximum current 120 mA
Dielectric strength
(open contact)
350V∼/-
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