M-Bus data centre
DR 120/250 (Discontinued)
Product categories
M-Bus data centre
System technology
Smart Building
Your benefits
- Modular design:
Can be used as data centre, M-Bus line repeater or level converter - M-Bus data centre with integrated modem connection:
Remote meter reading without access to the object - Transparent operation:
Unchanged transfer of read-out data to the communication device
Applications
- Remote supply and remote reading of M-Bus end devices
- On-site read-out of M-Bus meters via keypad and LCD
Properties
- M-Bus data centre for 120 or 250 M-Bus end devices with a standard load of 1,5 mA
- Transfer rates: 30 … 38’400 baud
- M-Bus protocol according to EN 13757-3
- Automatic Bus switch-off during short-circuiting and excessive current flow and automatic switch-on once the current has dropped
- Microcontroller-controlled functions
- Programmable read-out times and storage of numerous meter readings in the EEPROM
- Protected against voltage peaks on the M-Bus
- Displays for data traffic, maximum Bus current and excessive current flow/short-circuiting
- Modem connection and service interface
- Power supply via external 42 V mains adapter (included)
approved
Product information
Mains adapter
| Input | 230 V, 600 mA |
| Output | 42 V DC, 600 mA |
| Fuse | T2,5 A |
| Protection class | IP40 |
| Power consumption | Max. 30 VA |
| Wires | Brown: 42 V- Blue: 42 V+ Yellow/Green: earth |
Technical Data
| Power supply | |
|---|---|
| Voltage | 42 V DC (±5%) |
| Current consumption | Max. 630 mA |
| Power consumption | Max. 30 W |
| Housing | |
|---|---|
| Dimensions (HxWxD) | 90x215x240 mm |
| Protection class | IP52 |
| Material | ABS plastic |
| Colour | Anthracite, similar to RAL 7024 |
| Weight | app. 1,5 kg |
| Ambient conditions | |
|---|---|
| Operating temperature | 0 to +55 °C |
| Storage temperature | -20 to +60 °C |
| EMC data | |
|---|---|
| Emission | DIN EN 50081-1 EN 55022 class B EN 60555 |
| Immunity | DIN EN 50082-2 ENV 50140 ENV 50204 EN 61000-4-2 |
Terminals
| M-Bus | (+), (-) | 4 terminal pairs for M-Bus end devices |
| RS232 | CTS, RTS, TXD RXD, DSR, DTR, DCD, GND | Connection for RS232 |
| TSS | (+), (-) | M-Bus input for repeater function |
| Service | D-Sub-9 | Terminal for service interface (RS232) |
| Earth | E42V | Earth connection for 42V-mains adapter |
| 42 V | (+), (-) | Mains adapter 42 V DC (600 mA output current) |
M-Bus specifications
| Execution | DR 120 | DR 250 | |||||
|---|---|---|---|---|---|---|---|
| Parameter | mind. | typ. | max. | mind. | typ. | max. | |
| Max. no. of connectable devices (load unit 1,5 mA each) | - | - | 120 | - | - | 250 | |
| Normal operating bus current | mA | - | - | 180 | - | - | 375 |
| Display alarm current | mA | 195 | 210 | 225 | 385 | 410 | 435 |
| Excessive current switch-off | mA | 235 | 250 | 265 | 470 | 500 | 530 |
| Bus voltage MARK (normal operating current) | V | 39 | - | 42,5 | 36 | - | 42,5 |
| Bus voltage SPACE (normal operating current) | V | 26 | - | 31 | 24 | - | 30 |
| Bit threshold end device > centre | mA | 5,5 | 7 | 8,5 | 5,5 | 7 | 8,5 |
| Collision threshold | mA | 45 | 48 | 51 | 45 | 48 | 51 |
| Maximum cable length | app. km | - | 11) | - | - | 11) | - |
1) The maximum possible network reach (entire cable length) as well as the distance to the M-Bus end devices depends greatly on the network topology, the number of connected devices, the cross-section of the used cables and the transfer rate.
Dimension Diagram
