Instructions

tams elektronik
RedBox English
10. Background information
10.1. Motorola-Format
Märklin** originally introduced the Motorola format, using Chips from Motorola, hence the name.
First, only 80 addresses could be used, later this was extended to 255.
Data transfer in the Motorola format
Data is transferred in so called packets, which are sent with pauses in between. This kind of
data transfer results in DC power on the track. Hence, locomotives without decoder start moving
as soon as they are put on the track.
The previously developed Motorola I format relies on sending packets on two different
frequencies: One data packet contains the address information, the 14 speed level data, and the
status of one function and is continuously sent. A theoretically possible 15
th
speed level is used
to switch driving directions. The information about the state of additional functions is sent in the
second packet. This is only sent, if the status changes.
The later developed Motorola II format relies on sending one packet continuously: This packet
contains the address and the speed levels as well as additional information about the status of
the four functions and the absolute driving direction. The Motorola II format allows only 14
speed levels as well. In the meantime, decoders have become available, which support 27 speed
levels by adding additional “half levels” in between the existing speed levels.
Compatibility of both Motorola formats
Regardless which of the two Motorola format the decoder receives, it can change the speed
level, the driving direction and the function “light” correctly. To be able to use the four additional
functions, it must be controlled using the appropriate format.
Driving solenoid accessory decoders for the Motorola format
The information to switch solenoid accessory decoders (points und switching decoders) is sent in
the same second data packet in the Motorola I format as the information of the four additional
functions. In the Motorola II format, this second packet only contains information to drive
solenoid accessory decoders. This data packet is only sent, when the status of solenoid
accessory decoders changes.
With 80 addresses this adds up to 80 x 4 = 320, with 255 to 255 x 4 = 1020 addresses.
When calling address from a control unit, it must distinguish between locomotive and solenoid
accessory decoders, in order to control both. It depends on the control unit how this is done.
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