Digital Master

Signal processor driven M-Bus Master / Level- Converter for 120 or 250 slaves

Digital Master | Relay Australia | M-Bus | Automation Industries
  • modular design:

  • as Master with plug-in CPU-Board and integrated Master-Software

  • as Repeater for bus system extension (more than 250 slaves, more cable length)

  • as Level-Converter for RS232, RS485 or 20mA Current-Loop

  • Baudrates: 300 to 9600 Baud

  • Version for 38400 Baud with limited specifications

  • Bit-Recovery (recovery of bit times)

  • Overcurrent and short-circuit protection on the M-Bus

  • external voltage and lightning protection on the M-Bus

  • Echo cancellation and collision detection with break signalling

  • Displays for power, data transmission, max. bus current and short-circuit

  • 2 serial lines (modem and service)

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Digital Master Icons | Relay Australia | M-Bus | Automation Industries

Function of the M-Bus Central Unit

The M-Bus Central Unit scans the data from up to 250 meters in selectable intervals. All meters with M-Bus protocol according to EN1434-3 are automatically detected and read. This means that the user is saved the laborious task of configuring the measuring points in the software.


It is possible to operate the M-Bus Central Unit on-site by the keypad and the LCD, without any auxiliary devices. A PC can be used to read the stored meter data on-site or by a modem connection ( for example with a standard terminal software). The operating system is available in different languages and can easily be updated by software.

Digital Master Flow | Relay Australia | M-Bus | Automation Industries

Technical Data

Operating Voltage

42 DC

Power Consumption

max. 25W

Power Input

Temperature Range

0 .. 55 °C

M-Bus Voltage (without load)

40V

M-Bus Idle Current

Max. M-Bus Quiescent Current

M-Bus Current (C20)

M-Bus Current (C3)

M-Bus Quiescent Current

Bus Impedance

approx. 10 Ω

M-Bus Standby Current

max. 375mA bei DR001 (250 standard load)
max. 180 mA bei DR002 (120 standard load)

Overcurrent Threshold

500mA (DR001), 250mA (DR002)

Internal Bus Resistance

Bus Extension

Transmission Speed

Transmission Speed Optical

Bit Recovery

M-Bus Baud Rate

300 .. 38400 Baud

Galvanic Isolation

built-in

Housing

Grey ABS plastic,
protection class IP52
H x W x D: 85 x 200 x 240 mm

CPU

NEC V25 (8MHz)

LED Status Indicators

Control Panel

Display

Memory

512 kB FLASH (optional 4MB)
512 kB static RAM

Security

battery-backed real-time clock

Watchdog module

Operating Controls

Membrane keypad with 20 keys

LCD with 4 lines and 16 columns

Interfaces

M-Bus, RS232C, Modem intern, Modem extern

Screw Terminals

Terminals

Connectors

Data Memory

Dimensions H x W x D

Protection

Downloads

Software

Firmware WebGUI Version 1 (Broadway)

Firmware WebGUI Version 2 (HTML5)

Order Information

Order Number

Description

DR001

Master with CPU/Soft (250 Slaves)

DR002

Master with CPU/Soft (120 Slaves)

DR003

Level-Converter RS232 (250 Slaves)

DR004

Level-Converter RS232 (120 Slaves)

DR005

Level-Converter RS485 (250 Slaves)

DR006

Level-Converter RS485 (120 Slaves)

DR007

Repeater for system extension

DR011

Level-Converter TTY (250 Slaves)

Additional Accessories

Order Number

Description