BiDiB Data transmission

BiDiB protocol can be used for various transmission media such as serial connection, USB, RS485, Ethernet or wireless (with an adapted framing). Corresponding specifications can be found at the following pages.

The respective physical transmission layer ensures the correct framing and transparent byte transport of BiDiB message packets. Generally the transfer layer must secure the transport of the data with CRC.

Short summarize: BiDiB over Serial

Serial connection via RS232 or USB (virtual COM-Port), 3 possible speed settings (19200 Baud, 115200 Baud or 1MBaud), especially suitable for connections between computer and model railway layouts.

Short summarize: BiDiBus


BiDiBus is the model railway bus, which transmits BiDiB data within the model railway layout. BiDiBus is the easy to install and stable backbone of BiDiB within the model railway layout wiring.

It comes with the following advantages for the model railway enthusiast:

  • High speed
  • Secure transmission, insensitive to interference
  • Free wiring, easy configuration
  • Automatic notification of new nodes, no complex address allocation
  • Independent defective node failure detection
  • Large bus length, inexpensive cable
  • Open standard, future proof

BiDiBus key parameters

BiDiBus parameter (each segment)
Transmission technology: RS485
Speed: 500 kBaud
Wiring: Network cables (CAT5), max. 200m (656 feet), expandable via hubs
DCC-Bus: Integrated
Addressing: Automatic, no address allocation necessary
Hotplug: Connection and disconnection allowed during operation
number of subscribers: 32 at one level. over 1000 subscribers possible (via hubs).