SIC24 - Signal & Indicator Controller

The SIC24AD replaces the SIC24.
The SIC24 (Signal and Indicator Controller) is uniquely suited to control various types of signals and indicators on a layout or a CTC panel. It can be used as a signal controller, to indicate block occupancy and turnout position, and as a grade crossing gate controller with flashing signals. Combinations of some of these features are also possible. The SIC24 is compatible with many DCC systems* (see below).

MSRP - 54.95 USD

Manual in PDF format - 400K

Board size: 2.2" X 4.0"

Control signals on your layout
• Built-in logic for automatically controlling signals using block detection
• Configurable to model many signaling systems
• Computer not required, but can be used with one

Control indicators on your layout or CTC panel
• Block detection
• Turnout status
• Crossing gate and flashers

Provides 24 outputs
• Drives up to eight 3 LED signal heads with common anode or common cathode
• Drives Bi-color LED searchlights with 2 or 3 leads.
• Drives Tortoise™ switch machines for turnout control
• Drives Tortoise™ switch machines for semaphore signal control including the middle yellow aspect.

Provides 8 inputs
• For local turnout control.
• For occupancy sensors
• For turnout feedback sensors

Simple inter-board wiring
• Serial bus reduces system wiring
• Digitrax LocoNet® compatible

Simple basic setup
• Built-in setup configuration options
• "Smart Programming" in conjunction with self programming

The SIC24 sends and receives switch command, switch position feedback and sensor/block detection messages. It uses these same type messages to communicate between multiple SIC24s and to determine signal states. Since all communication is done over a serial bus, the number of wires to implement a signal system is greatly reduced. The serial bus is based on Digitrax’s LocoNet® and some features are unique to a Digitrax system. However, a Digitrax DCC system is not required for operation or programming. The SIC24 is compatible with LocoNet® block detectors such as the Digitrax BDL16 or detectors connected to its inputs such as the Team Digital DBD22 .

The SIC24 has 24 outputs. Each output can drive an LED and can be assigned a specific function. For signal control, a three color aspect signal will require three outputs if each aspect is to be individually controlled. Typical signal control is based on some set of rules or logic to turn each LED on. Consequently, some logic is required to turn on and off each output. In order to accomplish this, the SIC24 has a logic cell that controls each output. The logic is programmable using CVs. So you can control almost any kind of signals.

There are several build in selectable setups so that individual CV programming may not be necessary. These include block signals, block signals with a siding, block occupancy indication, grade crossing and block searchlight signals.

The SIC24 has eight inputs. Each input can be configured to send a switch command, switch position feedback or sensor/block detection serial bus message. The inputs are compatible with many stand-alone block detectors with noise filtering. Each input can be configured to send a message on a rising, a falling or a change of state signal. Unique signal schemes can be implemented using the SIC24 by connecting outputs to inputs, particularly if an input is configured to send a message on a rising or falling state.

The SIC24 can be very challenging to program because of it's logic capability. To assist in programming, there are several built-in setup options.  The setups are implemented using "Smart Programming" in conjunction with self programming. By entering several switch commands from the throttle, one of the setups is selected and configured. Once selected, the logic is automatically determined and all the required CVs programmed. The SIC24 comes pre-programmed for block signaling (ABS) of three aspects per signal which is one of the setups.  "Smart Programming" can be done via the main track or via LocoNet®.

Programming in page mode can be done using the programming track or via LocoNet®.  Ops mode programming is also available via LocoNet®. CV read back using the programming track may work in some cases, but it is not supported by Team Digital because it is not reliable.

The SIC24 is not compatible with the Atlas, Backmann or MRC (except Prodigy Advance) DCC systems because they do not support accessory commands or can not program the number of CVs in the SIC24.