Detailing the K-Line Mikado- Now with SWINGING BELL!!

So if you press the whistle button and the RCDR sends a signal of serial data to the Bell board, is there any output?  Or it only looks for bell signal.  G

MTH Authorized Service Center

Authorized ERR Dealer

Lionel Independent Repair Tech

Virginia Train Collectors Member

Norton posted:

John, note on the thread where the member blew up his bell board that his version did not have Legacy common, only frame ground. maybe that would work with an R4LC?? Something worth checking when you get all of your boards. I know on the bell board I am using it did require Legacy common that the RCDR did provide.

BTW I was also wondering if the requirement that the bell board would only work with Legacy is because of the signal common requirement or the 9 bit data requirement?

Pete

Pete, I see there are a couple versions of the bell board, and I suspect that could be a difference.  I'm going to have to trace these out and see how the serial data is received.

I'm almost positive Legacy only issue is the 9-bit data, several older Legacy models have the bell board with the R4LC and DC ground common with frame ground.  I just wonder if the newer version of the board changes the input circuit for the serial data.  If there's an opto-isolator on the input, it could work for both, that's what the Legacy-Lite RS board has.

This is the circuit that's on the old ERR Sound Converter, note that it supplies both isolated and non-isolated serial data capability.  Could be all of these have isolated serial data, I'll have to check.

Attachments

Photos (1)
GGG posted:

So if you press the whistle button and the RCDR sends a signal of serial data to the Bell board, is there any output?  Or it only looks for bell signal.  G

 

It only works with the bell signal. No movement with the whistle.

Pete

I am still confused. The RCDR comes in about 30 flavors.  So which are you using?  You saying that a TMCC version can run a Legacy Bell board? 

MTH Authorized Service Center

Authorized ERR Dealer

Lionel Independent Repair Tech

Virginia Train Collectors Member

I don't think it matters what Legacy RCDR you use. I think mine came from the Legacy 0-8-0. You just need a radio board that outputs 9 bit serial. A TMCC version will not run a bell board. I didn't know there were TMCC RCDRs. If there are they won't work.

Pete

gunrunnerjohn posted:

I'm curious on the RCDR equipped Legacy if we'll have an issue with the serial data ground not being frame ground.  For TMCC and early Legacy with the R4LC, frame ground and DC ground are the same.

I asked the question a while back on the BEMC boards when I installed it in my 3rd Rail loco/updating the Diagrams for BEMC and John Route responded with....

“The Ret is the serial date return reference.  It provides the same ground ref as the source of the serial signal.  This allows some boards to use 1/2 wave AC (required on receivers) to connect to full wave AC rectification powered PCBs like the BEMC.”

When installing those electronics I ran into a issue where I did not ground out the RET pin on the BEMC board to the frame. This was causing the board to not see the serial data clearly from the RCDR.

 

Dunno if this would answer your question John....

Bruk Bannister

-The Guy who made the RCMC & BEMC wiring diagrams.

Norton posted:

I don't think it matters what Legacy RCDR you use. I think mine came from the Legacy 0-8-0. You just need a radio board that outputs 9 bit serial. A TMCC version will not run a bell board. I didn't know there were TMCC RCDRs. If there are they won't work.

Pete

It only matters on what you are hooking up to it. Serial data is the same across the board....

I also used a 0-8-0 RCDR in my 3rd Rail conversion and I was going to hook up the backup light through the RCDR (less wiring than doing it through the RS-Lite/LTC1)

I had wired it like they had done in the auxilary tenders (as i show in the diagrams) and got nothing from the outputs. I did get coupler function but no lighting. I tried another board from a Hiesler did the same thing. 

Bruk Bannister

-The Guy who made the RCMC & BEMC wiring diagrams.

FWIW, I checked the bell board I have, it's the S01 version.  It has an opto isolating the serial data, so I resume that's standard.  The opto just goes between the serial data and the serial return with a 150 ohm resistor in the circuit.  Given that fact, it appears that you can use these with either an R4LC, RCDR, or the RCMC.

Add Reply

Likes (10)
CentralFan1976Ted SBWRRpittsburghrailfantexastrainNJCJOENathan Braising4daughtersTrainlover9943Mikado 4501


OGR Publishing, Inc. PO Box 218, Hilliard, OH 43026 330-757-3020
www.ogaugerr.com
×
×
×
×
×