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Transponding & Rocrail

Transponding can be ordered to the same category as Lissy and RailCom but uses another technique.

With the basic transponding decoders the following info is received by Rocrail:

  • decoder address
  • BDL168 board number
  • zone A, B, C, D, E, F, G or H

More advanced transponding decoders can supply also:

  • operations mode readback of decoder CVs
  • information about the speed and other status data
  • surround sound system support


To avoid conflicts with the current sense addressing bus 2 is used for the transponder receivers.
So if the board address is set to 1 the first transponder receiver will report in Rocrail with address 2-1, and the first sensor with address 0-1. (bus-address)

The BDL168 transponder addresses increment by 2, not 1. This means with board address 2 that Zone A is 1, Zone B is 3, etc. See this table:

Board 1 RX's
Zone Bus Address
A 1 1
B 1 3
C 1 5
D 1 7
E 1 9
F 1 11
G 1 13
H 1 15


OPSW9 Closed (No message sent if un-powered)
OPSW36 Closed (Ignore GPON)
OPSW37 Closed (Long delay for sensors)
OPSW38 Closed (Extra long delay for sensors)
OPSW39 Closed (Verbose mode enabled)
OPSW42 Closed (Respond also to first interrogate command)
OPSW43 Thrown (Filter for transponding enabled)
OPSW44 Closed (Extra filter for transponding)
OPSW45 Closed (Don't send transponding messages at GPOFF)

Test Setup


loconet/transponding-en.txt · Last modified: 2018/11/12 08:56 by