SMD82 - Switch
Machine Driver
The SMD82 is an eight (8)
output DCC accessory decoder (HO & N scale) specially
suited to drive switch (turnout) machines. It features 13
local inputs and 16 routes including conditional routes.
MSRP - 89.95 USD
Manual in PDF format - 470K
Color
Picture
Board size: 2.75" X 4.25"
Operation:
The SMD82 is capable of driving eight solenoid and/or
stall motor type switch machines. It contains a Capacitor
Discharge Unit to store energy. A discharge of this
energy is used to energize the solenoid to change the
switch state. Using a CDU reduces the current drawn from
the track to a small level sufficient to recharge the
CDU. However, once the CDU has been discharged (a switch
state changed) a time period is required for the CDU to
recharge. This is typically about three seconds. Since
more than one switch may be requested to change state at
the same time, as in a local route, the requests are held
so that each switch may change state in turn. A stall
motor type does not use the CDU and therefore, no
recharge time is required when activated.
There are four output configurations: short pulse for
solenoid type machines, continually on for stall motor
type machines, eight second pulse (variable) for stall
motor type machines where reduced track current is
desired and manual control.
The eight outputs of the SMD82 can individually be
assigned any address from 1 to 2040. There are 13 inputs
available for local control. An addition eight inputs are
available with the use of some resistors.
Two types of route control are supported. The remote
controlled routes are controlled from the throttle just
like a single switch is, except that multiple switches
may be activated. The local routes are activated by using
the inputs. Routes are configured by programming the
respective CVs as to which outputs are selected in the
route and the output state. Remote controlled routes are
in two groups of eight. Each group has a group address to
allow the throttle to access it.
Conditional routes can be established so that an input
can not activate it's route unless another input is
activated.
Programming:
“Smart” programming is a term used to
describe a method to program Configuration Variables
(CVs) using switch addresses. This method is a much
easier way to program CVs. With “Smart”
programming, you can set the output addresses and the
output configuration for solenoid or stall type switch
machines.
For route and custom setup, the SMD82 supports Paged Mode
Programming in Service Mode and Ops Mode. Ops mode
programming is very convenient because you can try out
the CV changes almost immediately. "Power on" Ops mode is
an additional temporary mode that provides a very quick
method of programming CVs.
Compatibility:
The SMD82 has been specifically tested with the Digitrax
DCS 50 and DB 100 systems and the NCE Powerhouse Pro
system.
