Impulse 8112 - Manual (Page 35)

© Sealevel Systems, Inc. - 33 - SeaDAC Lite User Manual
I/O Wiring – SeaDAC Lite 8126 TTL Module
The 8126 addresses the 32 channels of buffered drive digital I/O as four eight-bit
ports, each programmable as input or output. The I/O channels are accessed via an
industry standard 50-pin header connector. Use a standard 50-pin IDC ribbon cable
to connect an industry standard relay rack, terminal block (Item# TB07), or relay rack
simulation module (Item# TA01). Each channel can sink up to 64mA or source up to
32mA. All channels combined cannot exceed a total output of 350mA.
NOTE: Relay racks with less than 32 channels expect all even pins to be
commons. When using relay racks with less than 32 channels, set
Port D as an input to avoid shorting the outputs to ground through
the relay rack.
126 – 50-Pin Header Connector 8
The 8126 has the following pin out which is compatible with a wide variety of
industry standard solid-state relay racks.
NOTE: The 8126 modules are designed to work with industry standard
solid-state relay racks that expect negative logic to operate. The
8126 modules expect positive logic on the inputs.