MXTAP - decoder test board

Overview

Note: at this time, this information is preliminary and I am checking for correctness, I don't guarantee my information is correct.

Clearly a quality product with a huge amount of flexibility. I purchased at the recommendation of Train-Li and it was a smart move.

There is no real manual, lots of pictures in the MXULF manual.

Road Map of the board:

Jumpers:

It's important to identify these, and the board is shipped with all jumpers in place. My current thinking is you should remove the jumpers (in most cases just connect one leg)

Sorry for the bad pictures... will improve on them.

Overall guide:

• you can see the motor on the right side
• above the motor is a black box, 3d printed, is the speaker
• near the bottom right side is the power input
• There are a number of LEDs on the board to indicate things, will describe later, but note the function output LEDs on the upper left side, you see that LV and LR are the front headlight and rear headlight respectively.

Jumpers

It's important to know some of the jumper definitions:

• X2 – Loudspeaker internal (on MXTAP board) vs off board
  in the picture above, it is the RED jumper just above and to the right of the speaker box, It is in the left position, "INT" meaning connected internally to the speaker you see

• X4 – Motor internal (on MXTAP board) vs off board
  In the picture above, it is the RED jumper just above and to the right of the motor. It is in the left position, "INT" meaning connected internally to the motor you see

Most likely you will leave these two in place, unless you need to test a speaker or motor off board. If you need to connect external devices, you can see the GREEN terminal connector at top center with "EXTERN." and the legends: LS LS (loudspeaker) and M+ M- (motor plus and minus)

More jumpers that should be paid close attention to, and BEFORE you plug in a decoder:

• X11 – MX630 output pin remap LS+/LS- to FA3/FA4 LED on MXTAP
  In the picture above, it is the BLACK jumper to the right of the speaker and slightly above center line "MX630", it is installed/active

• X12 – MX 685 output pin remap M+/M- to FA5/FA6 LED on MXTAP
  In the picture above, it is the BLACK jumper to the right of the speaker and slightly below center line "MX68x", it is installed/active

• X13 – MX618 output pin remap LS +/- to FA5/FA6 LED on MXTAP
  In the picture above, it is the BLACK jumper on the upper right edge of the board, just below the tan SUSI connector "MX618", it is installed/active

• X14 – LL/OC (concerns FA3 and FA4 Open Collector vs Logic Level configuration)
  In the picture above, it is the RED jumper at the left edge of the board, near the top. It is set in the "OC" position. You set this jumper to correspond with the F3 and F4 output types of the decoder, for example the mx634C and mx644C should be set to "LL"

It's important to address these jumpers first, since they affect the operation of the LEDs. In these cases some decoders use pins differently than "standard" and remap the Motor or Loudspeaker pins to function outputs. These jumpers allow you to customize the onboard LEDs to indicate these "relocated/remapped" pins.

Also note the "remapping" jumpers (X11, X12, X13) can be left off unless needed, X14 should follow the requirements of the decoder as stated.

Connecting a decoder:

Clearly you can see the sockets for various Zimo decoders

For decoders with wires, the green connector on the bottom center

• • +V/F4 - function output 4, alternatively the decoder common (V+) can be connected here
  • F3 - function output 3
  • F2 - function output 2
  • F1 - function output 1
  • LR - headlamp rear (Rückseite)
  • LV - headlamp front (Vorderseite)
  • M+ - motor plus
  • M- - motor minus
  • SR - rail right? (Schiene Rechts)
  • SL - rail left? (Schiene Links)
  • LS - loudspeaker (LautSprecher)
  • LS - loudspeaker (LautSprecher)

Buttons:

There are also a number of buttons:

1. PB1 – reed 1, momentary
2. PB2 – reed 2, momentary
3. PB3 – reed 3, momentary
4. PB4 – main power on and off, latching

LED descriptions

• there are the LEDs for the functions F0 through F13 (F0 has front and rear), upper left side
• there are clock and data indicators for the SUSI bus, upper right corner by the tan SUSI connector
• There are forward and reverse direction indicators for the motor, on the right edge just right of the motor
• there are the L and R LEDs just to the left of the black power on/off (to the left of the track input connector), these may be across the track inputs and could indicate if you have AC or DC, will test out.
• There is an NSP led, don't know what that is
• There is a CAP+ LED, again no idea, perhaps ELKO?
• There is are VENT1 and VENT2 leds, no idea how they are used
•  There is a +V led, indicating that board is getting the "+24" volts.

Note: the V+ / 24V supply is recovered from either:

• the track or
• common positive of the decoder, or
• the V+/FA4 connector green X3 connector

And is really the actual voltage supplied, usually down by one diode drop, it is not an independently generated supply voltage