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Modbus Bias Module


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MBM-1 eliminates Modbus RS-485 floating pin errors. Dyacon Modbus Bias Module was designed to provide specific pull and termination resistors in a rugged, convenient package.

PN: MBM-1.



Product Details


Manuals & Software

Modbus data can be transmitted using RS-485 networks. These can be configured as full-duplex or half-duplex data buses. Half-duplex networks use the same lines for receive and transmit.

In half-duplex configurations, when neither a slave or master is driving the bus, the lines may float to marginal voltages. Floating data lines can sometimes cause the receiver chips to see data when there is really nothing there. The result is intermittent communication errors (framing and CRC errors).

Data errors can be prevented by pulling the lines to the idle state. However, if too many devices on an RS-485 include pull resistors, the data signal can be affected. Consequently, device manufacturers may leave it up to the automation technician to understand the nature of the network and add biasing as required.

Dyacon Modbus Bias Module MBM-1TM was designed to address this issue by providing specific pull and termination resistors in a rugged, convenient package.

MBM-1TM is available for specific devices powered by 5 V, 12 VDC, and 24 VDC supplies.

Feature Summary

  • Pull and termination
  •  Fully potted
  • Pluggable terminal blocks
  • Made in USA.


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