The following pages and posts are tagged with

TitleTypeExcerpt
Adapter-CMRI8-RJ45 Page CMRI Breakout8 Adapter RJ45 to 0.100, 3.5mm and 0.156 Molex
Adapter-IO4-Breakout Page RJ12/6 breakout board, inline IO4-IO4 probe
Adapter-RJ45-SignalHead Page RJ45/8 breakout board, for driving signal heads from IOB-Signal
CAN-Bus-Interface Page CAN Bus driver for OpenLCB
CMRI-Bus-Interface-L Page RS422/485 driver for CMRI-Net - large 3" Tyco rail size
CMRI-Bus-Interface Page RS422/485 driver for CMRI-Net
IOB-Inputs Page IOB interface provides 1x IO4 port with 4x Input i/o lines.
IOB-Outputs Page IOB Interface provides 1x IO4 port with 4x open drain output i/o lines.
IOB-RR-CirKits Page IOB Interface with an 8-bit RR-CirKits-style 2x5 (10-pin) ribbon cable connector
IOB-Signal Page IOB Interface drives 2x Signal Heads via a RJ45/8 connector.
IOB-Turtle Page IOB Interface provides 1x IO4 port for connection to an IO4-Turtle
IOB-Generic Page IOB interface provides 1x IO4 port with 4x generic (hardwired) Input or Output i/o lines.
LocoShield Page An electrical interface to Digitrax Loconet
MRCS-12v-power-block Page Power distribution block for cTc controlled locked turnouts
MRCS-Adapter-RJ11 Page MRCS - RJ modular Headset connector breakout board

You are free to download these files and make your own boards.