Page 44 H0 Sound Decoder MX640
13. MX640 with Märklin MOTOROLA systems
The only time it makes sense to use the MX640 in the MOTOROLA mode is when one is forced to
use a system that is not capable of operating in DCC. DCC is much more efficient and is therefore
the preferred mode in multi-protocol systems.
The MOTOROLA format is automatically recognized by the decoder.
Address and CV programming
is possible with a Märklin system although very tedious (little sup-
port from the system):
P R O V I S I O N A L I N S T R U C T I O N S :
Programming MX640 CV's with Märklin 6021 central unit:
Start the programming mode by:
1. selecting the address of the engine to be programmed
2. press the "STOP" key at the central unit and wait a few seconds
3. Crank the speed regulator past the left stop and hold
4. press the "START" key
5. release the speed regulator
The front headlight of the engine should now be flashing once per second indicating that the de-
coder is in the programming mode.
You can now choose between two programming modes:
1. Short mode: programming is limited to CV’s 1 – 79 and a value range from 1 – 79
2. Long mode: the values to be used in each case are split and transmitted in two steps (CV 1-799,
value range 0-255)
The short mode is always active after entering the programming mode.
To change to the long mode write 80 to CV #80 (enter address 80 and change direction twice to
change to the long mode).
Short mode:
Enter the CV to be programmed in the central unit as an address and briefly operate the direction
switch.
The headlight now quickly flashes twice.
Now enter the desired value to the selected CV and again operate the direction switch briefly (enter
80 for a value of 0).
The headlight flashes once indicating that you can program the next CV or end the programming by
turning power to the track off.
Long mode:
Remember to enter address 80 for a value of 0!
Enter the hundreds and tens digit in the central unit of the CV you want to program (for example: for
CV 123 enter 12) and operate the direction switch.
The headlight now quickly flashes twice.
Now enter the ones digit of the same CV (for example: for CV 123 enter 03) and operate the direc-
tion switch again.
The headlight briefly flashes 3 times.
Enter the hundreds and tens digit in the central unit of the value you want to program and operate
the direction switch.
The headlight briefly flashes 4 times.
Now enter the ones digit of the value and operate the direction switch again.
Again, the headlight flashes once indicating that you can program the next CV or end the program-
ming by turning power to the track off.
