digirails DIGISERVO DR4024 Manuel page 12

DR4024 DIGISERVO (v1.31)
Detailed description
General
The DIGISERVO decoder is a fully programmable, multi-protocol servo decoder. The decoder has connections
for 4 model-making servos. In addition, the module has a further 4 on-off switching outputs which can switch
simultaneously or separately, according to the desired configuration.
The DIGISERVO decoder is the first servo decoder that operates entirely on the basis of function mapping. The
decoder sees the 'switching addresses' as control functions for the various outputs. The decoder can use 1 to 8
'switching addresses' depending on the mapping that has been set up.
Each address that is recognised controls a virtual switch in the decoder.
The switching command 'right' (green) turns the switch on; the switching command 'turn off' (red) turns the
switch off.
There are two function map CV groups for each switch.
1 group with 3 CVs for 'on', 1 group with 3 CVs for 'off'.
CVs 141-188 can then be used to select which of the 4 servos or decoder outputs should be activated.
Servo positions
The decoder has 4 possible positions (A, B, C, D) for each servo, which can be activated with the mapping men-
tioned above. The resolution of these positions is 0.4% of full range of movement. For a complete turn of 90 de-
grees, this means 0.36 degrees per step. The decoder uses positions A and B by default.
The decoder can also be set up per servo to carry out a damped oscillation when the end position is reached
(mass simulation).
Switching outputs
The servo and switching outputs are grouped in the decoder.
The switching outputs have an FET switch to GND. The extra switching outputs feed the common plus.
The moment these outputs switch can also be linked to the corresponding servo.
For example, the switch can be activated at one out of the end positions or in the middle position between the
end positions. These outputs can be used, for example, to polarise or de-energise a points relay (US: railroad
switch relay) for a stop section in the event of signal control.
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