Wireless M-bus pulse counter type
wMBHL-2
w
M-BUS Series
Instruction Manual
wMBHL
is microcontroller-based pulse counter with 2 pulse inputs and wireless m-bus interface.
It is used for connection of tax meters with pulse outputs for wireless readout. It can be mounted on the
wall, not for DIN-rail and comes in IP 54 enclosure. wMBHL does not support tariffs, but user can set initial
value for each pulse input and multiplier (pulse weight). Device works on battery and has estimated life of
10 years, while transmitting every minute. Minimum pulse length to be measured is 50ms (10Hz pulses),
which for water meters is more than enough.
1. Main technical parameters
- pulse inputs
– 2
- supply voltage
– 3.6 Vdc
- wireless m-bus mode
– T1, OMS compatible
- pulse frequency, max
- 10 Hz
- input NO resistance
- 470 kOhm
- indication
- one yellow LED
- storage temperature
- -50
÷
+90
°
C
- air humidity, working
- 40
÷
90 %
- dimensions (H/W/D max)
– 74/74/40mm
- communication parameters
– 4800 bps, Even
- weight
– < 30 g
- battery
– 3.6Vdc, 10+1 years life
2. How wMBHL works
wМBHL comes into storage mode. This means that the counter is not enabled to transmit and
count pulses. This is made in order to preserve battery. Device can be turned ON via our software, using
optical head, or by a pushbutton on the PCB board. Once enabled pulse counter CAN NOT be returned in
storage mode. Then wMBHL starts to work in normal mode. This means that all pulses on the two inputs are
counted and stored in internal memory. Each minute device sends an wireless m-bus telegram in mode T1,
in which total value for both inputs is transmitted. Total value is calculated by taking in hand pulse weight
(multiplier) and initial value, set for each input. By default initial value is 0 and multiplier is 1 (1l/pulse).
Transmitting time can be changed from 30 seconds to 3 minutes, by step of 10 seconds. User can
also save AES-128 key (Mode 5) and enable or disable AES encryption of the telegram.
The battery life is guaranteed for 10 years of work, transmitting every minute.
Turning wMBHL on
Turning on wMBHL is done via wMBHL setting software and is irreversible. User can also use a
pushbutton on the board to do that. Push button must be pressed and hold down for 6 seconds, then
wMBHL will go into normal work mode.
3. Mounting and electrical connections
wМBHL can be mounted on a wall or other horizontal or vertical surface. Every connection should
be made with 0.25mm
2
1.5mm
2
isolated cables, according to the following table:
No. on the picture
Description
IN 1+
Positive terminal pulse input 1 - if open collector used
IN 1-
Negative terminal pulse input 1
IN 2+
Positive terminal pulse input 2 - if open collector used
IN 2-
Negative terminal pulse input 2
Max. length of each pulse input cable is 15m for twisted pair 0.5mm
2
.
4. Inputs and pulse counting
wМBHL has two independent inputs for pulse counting. Pulse weight for each input can be
programmed independently. The pulses are collected in separate arrays for every input. Pulse counts
specially of MBHL can be changed through the Gineers software. The idea is to have same on counter and
water-meter. Pulse counters are stored in non-volatile memory at every power interruption. The data is also
save in non-volatile memory once a month.
Maximum pulse frequency can be 20Hz. The input pulses can come from:
- non-potential contact (reed contact)
- transistor opto-coupler output
- open collector, if it can work on 3.3Vdc
In the last two cases the polarity must be observed. The minimum resistance of the open contact
should be greater than 1 MOhm, while the maximum resistance (including connecting cable resistance)
should be less than 1 kOhm. Connecting cable length should be no greater than 15m. It is recommended to
use twisted pair cable type.
Counters rollover to zero when value of 99999999 is reached.
6. Warranty
The warranty of the device is limited to 3 years from the date of sale. If the device shows any
defect or malfunctions during that period, the manufacturer is obligated to repair the device in its own
service for manufacturer’s expense, or, if the repair is impossible, to replace the device with the new one.
The transportation costs to the manufacturer’s service are due to the client. The warranty voids if this
manual’s instructions are not met, warranty seals are removed or the device was opened by unauthorized
by the manufacturer personnel.
Serial/ ID number:....................
Date of sale: …...........................
Signature: ..................................
7. Package contains
wMBHL - 1 pc.
Instruction manual - 1 pc.
8. Manufacturer
Gineers Ltd., bulding 7, “Iskarsko chausse” 7 blvd.,
TCE, 1528 Sofia, Bulgaria
Tel/fax (+359-2) 9758105,
URL: http://www.gineers.com,
e-mail: [email protected]
