
27.11 Lights Flash First Time Loco Placed On Track
Check your decoder installation for a motor short circuit. Some decoders have
motor fault protection that causes this symptom when there is a short in the
installation.
28.0 Glossary
14 Speed Step Mode:
the motor voltage/speed curve of the DCC loco from
stop to full speed has 14 discrete speed steps. This means that speed control
will be limited to just 14 steps. 14 speed step mode gives reasonably good
speed control. Increasing to 28 speed step operation will give much better
speed control and going to 128 speed step operation will give really excellent
speed control. 14 Speed Step Mode is offered in most command stations
because there are many decoders on the market that are not capable of 28 or
128 step mode.
28 Speed Step Mode:
the motor voltage/speed curve of the DCC loco from
stop to full speed has 28 discrete speed steps. This means that speed control
will be limited to 28 steps. 28 speed step mode gives fine speed control.
Increasing to 128 speed step operation will give a significant improvement in
speed control, especially at very slow speeds needed for prototypical switching
operations. Advanced mode is offered in most command stations because there
are decoders on the market that are not capable of 128 step mode operation.
128 Speed Step Mode:
the motor voltage/speed curve of the DCC loco from
stop to full speed has 128 discrete speed steps. This means that you have 128
discrete speed steps at your disposal for excellent speed control, especially at
very low speeds. 128 speed step operation will give a significant improvement
in speed control over 14 or 28 step operation. 128 speed step operation is only
offered in advanced and professional level DCC systems.
2 Digit Address:
decoder address between 01 & 127 which is expressed as a 2
digit number. Addresses above 99 are expressed as hexadecimal numbers. The
DT400 translates these numbers into three digit numbers 100-127. Technically
a 2 digit address is a 7 bit address and is the baseline packet format for DCC
addresses. It is sometimes called the short address.
4 Digit Address:
decoder address between 0128 & 9983. Not all 4 digit
addresses in this range are actually available for use. Your DT400 can access
0128 through 9983. Digitrax handles addresses below 0128 as two digit
addresses to avoid confusion. Technically a 4 digit address is a 14 bit address
and is considered an extended packet format DCC decoder address. Sometimes
this is called the long address.
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