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Modbus RTU Connection Module

for installations with the In-Rail-Bus system

The Modbus RTU Connection Module is used to connect the 24 V supply and the Modbus lines A and B to the In-Rail-Bus DIN rail connector.

The power supply and the Modbus lines are connected to the terminals of the module (screw terminals). The connection to the In-Rail-Bus DIN rail connector is made via the rear spring contacts. All other DRAGO I/O modules are thus pre-wired via the In-Rail Bus with power supply and bus lines.

DIP switches can be used to switch the termination and polarization resistors normally used for RS485 interfaces. An additional line is available for group messages, e.g. for a group error message, as far as this is supported by the I/O modules.

The Modbus RTU connection module can also be used for feed out, especially if further modules are to be connected in separate installations. Additional terminals for the bus lines are provided for this purpose.

Product line

Product line DMB 96000
Device Type Order No.
Modbus RTU Connection Module DMB 96000 B

Technical Data

General Data

Supply voltage 24 V DC, 0.3 W
Voltage range 16.8 to 31.2 V
Input current ≤ 4.5 A
Recommended fuse 5 A slow-blow
Voltage drop ≤ 0.2 V
Indication LEDs Operating and fault       green/red
Modbus communication    yellow
Ambient temperature Operation: -25 °C to +70 °C (-13 to +158 °F)
Transport and storage: -40 °C to +85 °C (-40 to +185 °F)
EMC EN 61326-1
Construction 6.2 mm (0.244") housing, protection type: IP 20, mounting on 35 mm DIN rail acc. to EN 60715
(captive plus-minus clamp screws)
Solid: 0.5 mm² - 4 mm² / AWG 20-12
Fine-stranded: 0.5 mm² - 2.5 mm² / AWG 20-14
Stripped length: 6-8 mm / 0.28 in
Screw terminal torque 0.8 Nm / 7 lbf in
Weight Approx. 70 g

Block diagram


Terminal assignments

  • 1 Modbus A
  • 2 Modbus B
  • 5 Modbus A
  • 6 Modbus B
  • 3 Gruppenmeldung
  • 4 GND
  • 7 + Versorgung 24 V
  • 8 − GND
  • A Modbus A
  • B Modbus B
  • C − Versorgung
  • D + Versorgung 24 V
  • E Gruppenmeldung (GM)

Subject to change!

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