JMRI's support for the Digitrax PR4 has been updated to reflect the PR4's inability to provide "LocoNet Data Signal termination".
This is a correction to JMRI's previous implementation
of PR4 functionality. It reflects a more-accurate understanding of PR4 features
by the JMRI development team.
When configuring a JMRI "connection" for the
PR4, the "Command station type" of "Stand-alone LocoNet" is
no longer available. Users with an existing PR4 connection which has been
configured for a "Command station type" of "Stand-alone
LocoNet" should change their "Command station type" to some
other selection, such as "DCS100", and save the configuration
profile.
Because LocoNet requires some source of "LocoNet
Data Signal termination", and because the PR4 is not capable of providing
that feature, it will be necessary to provide it using some other piece of
LocoNet hardware. Both commercially-available and do-it-yourself options are
available, as described in the "LocoNet Data Signal termination"
section of the JMRI "Standalone LocoNet" help page.
UPDATE:
The Digitrax PR3 is capable of providing the required termination.The documentation pointed
to above under the heading PR3 has kept up with the changes made in
JMRI although it doesn't appear to since the selection "Stand Alone Loconet" in JMRI Preferences does not reflect what the documentation states. Here is the reply received when the author brought this point up to the
JMRI users’ group on groups.io.
BillyBob experimenter wrote:
John G wrote about a JMRI "Documentation error" in the
JMRI help which describes standalone loconet connections.
Yes, somewhere along the way, JMRI code changed, and those
specific options changed. And the documentation was not changed to match.
What is currently implemented is "Stand-alone
LocoNet". It is equivalent to "Stand-alone LocoNet; interface
device 'terminates' the LocoNet Data signal ".
Regards,
Billybob
Thanks to BillyBob experimenter for
the reply and the outstanding work being done by the JMRI developers. No doubt this will be updated somewhere in the next couple of JMRI updates.
If you have an idea for a blog post here, let me know. If I can comment on it, I will or I'll see if someone else can and post it.
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