Troubleshooting - Roco and Fleischmann Z21 Manuel D'utilisation

Model Railway Control Unit
Bootloader mode (e.g. during firmware update)
Colour
Blue
Red
Green
White
Blue
Red
Green
White

8. Troubleshooting

Error flashes red:
The outputs of the Z21 signal DECODER are electronically protected against overload and short circuits. The total switching capacity
per output totals 400 mA, and the maximum total current of all outputs 2A. In case of overload, all outputs are switched off and the
red "Error" LED flashes for several seconds. During this time, the decoder does not accept any new switching commands. The decoder
then resumes normal operation.
Signal addresses are shifted by four:
Check that the set addressing mode matches your control centre. See section
POM read (RailCom
®
Check the correct connection on the Z21 (P and N). See section
See also section Operation on control centres from other
It may be that the control centres used are not compatible with RailCom
Connected LED is not lit:
Ensure that the polarity is correct. See section
60
Status
on
on
on
on
on
on
flashes briefly
on
) is not functioning:
Connecting the Z21 signal
Meaning
Wait for data/commands from zLink.
Bootloader mode active.
Data/commands are processed by the zLink.
Bootloader mode active.
Operation on control centres from other
Connecting the Z21 signal
manufacturers.
.
®
DECODER.
manufacturers.
DECODER.