Potomac Module Crew's Railroad Shop

Potomac Module Crew's Railroad Shop
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Potomac Module Crew's Railroad Shop - DCC Decoder Notes

Digitrax Decoders:

MRC Decoders:

Lenz Decoders:

Special Decoder Topics:

Digitrax Decoders:

DH121 (Rev 21 & 22) problems:

Loco Speed Step codes:

Status Digit	Meaning	Best Used for
00	New, non-refreshed, Normal 28 step
02	New, non-refreshed, Baseline 14 step
03	New, non-refreshed, 128 step
04	New, non-refreshed, 28 step FX Decoder
07	New, non-refreshed, 128 step FX decorder
10	Common, refreshed, Normal 28 step	Lenz's 28 step decoders and all Digitrax decoders
12	Common, refreshed, Baseline 14 step	Lenz's 14 step decoders and MRC decoders.
13	Common, refreshed, 128 step
14	Common, refreshed, 28 step FX Decoder	Digitrax's decoders with FX features (i.e. DH84FX, DH121)
17	Common, refreshed, 128 step FX decoder	Digitrax's decoders with FX features (i.e. DH84FX, DH121)

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MRC Decoders:

MRC Decoders and Digitrax system:

Setting 14-step MRC decoder:

Turn either the right or left knob for selected engine control.
Once the knob is selected, push 'SEL | SET' button.
The engine channel will be on the first two digits to left side and flashing.
Turn the left knob to select engine assigned number.
Once the engine assigned number is shown, push 'SEL | SET' button.
Now push 'SEL | SET' once again.
Next, push 'FUNC | F0' which will change the flashing of two digits on the left to two digits on the right.
Turn the right knob to '12' is the setting for baseline 14 step and refreshed)
Now push 'SEL | SET' to entry speed step selection.
Now you are ready to run your locomotive.

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Lenz Decoders:

Setting 14-step Lenz decoder

Turn either the right or left knob for selected engine control.
Once the knob is elected, push 'SEL | SET' button.
The engine channel will be on the first two digits to left side and flashing.
Turn the left knob to select engine assigned number.
Once the engine assigned number is shown, push 'SEL | SET' button.
Now push 'SEL | SET once again.
Next, push 'FUNC | F0' which will change the flashing of two digits on the left to two digits on the right.
Turn the right knob to '12'. ('12' is the setting for baseline 14 step and refreshed)
Now push 'SEL | SET' to entry speed step selection.
Now you are ready to run your locomotive.

Setting 28-step Lenz decoder:

Turn either the right or left knob for selected engine control.
Once the knob is elected, push 'SEL | SET' button.
The engine channel will be on the first two digits to left side and flashing.
Turn the left knob to select engine assigned number.
Once the engine assigned number is shown, push 'SEL | SET' button.
Now push 'SEL | SET once again.
Next, push 'FUNC | F0' which will change the flashing of two digits on the left to two digits on the right.
Turn the right knob to '10'. ('10' is the setting for baseline 28 step and refreshed)
Now push 'SEL | SET' to entry speed step selection.
Now you are ready to run your locomotive.

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Special Topics:

Using Roco's Digital Crane:

Turn either the right or left knob for selected engine control.
Once the knob is elected, push 'SEL | SET' button.
The engine channel will be on the first two digits to left side and flashing.
Turn the left knob to select engine assigned number.
Once the engine assigned number is shown, push 'SEL | SET' button.
Now push 'SEL | SET' once again.
Next, push 'FUNC | F0' which will change the flashing of two digits on the left to two digits on the right.
Turn the right knob to '22'. ('22' is the setting for Idle, non-refreshed, baseline 14 step.)
Now push 'SEL | SET' to entry speed step selection.
Now you are ready to operate the crane.

(YELLOW LED)

F0 'on', F1 'on'.
The (YELLOW LED) will be steadily on.
A forward mode (GREEN LED) will raise the hook, and reverse (RED LED) will lower the hook.

F0 'off', F1 'on'.
The (YELLOW LED) will blink slowly.
A forward mode (GREEN LED) will raise the boom, and reverse (RED LED) will lower the boom.

F0 'on', F1 'off'.
The (YELLOW LED) will blink fast.
A forward mode (GREEN LED) will rotate the crane clockwise (right), and reverse (RED LED) will rotate the crane counter clockwise (left).

F0 'off', F1 'off'.
The (YELLOW LED) will be off.
To active the magnet, push the direction button to forward mode (GREEN LED) then turn the speed knob up once briefly then back to zero.
To release the magnet, push the direction button to reverse mode (RED LED) then turn the speed knob up once briefly then back to zero.

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