MBRS-32 is a microprocessor two-way full-duplex M-bus to
RS-232С converter, with ability to supply maximum of 32 M-bus
slave devices. It is intended for use in housing constructions
and industrial buildings mainly for distance reading of tax
instruments or different types of sensors. It is protected
for short circuit in the output. In 2012 we have changed the
enclosure, on the picture you can see old enclosure. Mounting
of the unit is done on a standard М36 DIN-rail.
user
manual old enclosure
user
manual new enclosure
| nominal output voltage (mark) |
36 VDC ± 1 V |
| maximum count of slave devices |
32 |
| maximal output current |
70mA |
| output voltage in condition ‘0’ (space) |
22 ÷ 25 VDC |
| power supply |
150-250 VAC (200-350 VDC) |
| power consumption |
< 4 W |
| maximum baud rate |
4800bps |
| humidity |
40 ÷ 90 % |
| work temperature |
from -20° C to +55° C |
| storage temperature |
from -50° C to +90° C |
| longest distance in the network with one
MBRS |
1200m |
| display |
3 leds old version, 5 leds new |
| dimensions (HxWxD), mm |
75/50/105mm or 86/70/57mm |
| protection class |
IP30 |
| weight |
200 g |
МBRS-32 starts to operate immediately after connecting
the supply voltage to it. The algorithm of work is as follows:
Starting initialization mode (0.2-0.3 s)
For about 0.2-0.3 s the device is busy with initialization
of important parameters. During initialization the output
is forbidden and the output voltage is 0 V. Output becomes
active, the unit then measures current consumption of the
connected slaves. Led ‘bus’/'TX' (allowed output/transmit)
become active. If short circuit, the output is held forbidden
and after a few second a new check is done, while led ‘bus’/‘ТX’
are turned off.
Normal operation mode
Continuously the unit measures current consumption of the
connected slaves. If the consumed current becomes higher
than 70 mA, the led 'alarm' is turned on. If the consumed
current becomes higher than 90mA, the output is forbidden
and turned off. When connecting the device to a collecting
unit (personal computer, etc.) by RS-232 interface, the
collecting unit can transmit data to any slave device in
the m-bus network. In this case the MBRS-32 is a dedicated
bridge for the connection between computer and slave devices.
The data is transmitted immediately, without delay. When
a slave device is sending information, this data is first
decoded according to RS-232 protocol and then send via RS-232
serial port, with no delay. It is possible simultaneously
to transmit/receive data. If collision (two or more slave
devices send instantly), the led ‘coll’ (collision) is turned
on, although the data is transmitted via serial RS-232C
interface.
МBRS-32 is mounted on a standard М36 DIN-rail. All wiring
is done by isolated cables with size 0.25mm2 ÷ 2.5mm2.
In order of correct work, the wiring must be done according
to the following tables:
| C1 “Power” |
|
| No. |
Description |
| 3,4 old enclosure/13,14 new enclosure |
Input power supply L, N |
| C2 “M-bus” |
|
| No. |
Description |
| 1 |
Output M-bus, + |
| 2 |
Output M-bus, - |
| C3 'RS-232C' - type RJ-45 |
|
| No. |
Description |
| 1,4,6,7,8 |
NC |
| 2 |
RxD (Receive) |
| 3 |
TxD (Transmit) |
| 5 |
GND |
