Signal Driver Module for DBM
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The SDM is an output card for use with the DBM signal controller. There are different versions of the SDM to allow for common-anode (CA), common-cathode (CC) and bi-color LED applications.
Each SDM has 8 output pins. For CA and CC versions, eight (8) LEDs can be driven. For BC versions, 4 bi-color LEDs can be driven from a card. Each card is equipped with built-in limiting resistors so that you do not need to add your own.
The DBM allows for multiple signals to be defined per SDM, such as signals with a single head of R/Y/G (3 outputs). A signal can be assigned partially to one SDM and span into the next slot if a SDM module is present. This allows for compact assignment of signals as well as large signal definitions of greater than eight (8) LEDs.