32 outputs, each providing 150 milliamp current sinking (open drain) power. Connect to external voltages up to 24 volts or power directly from the card, up to 16 volts.

Supported by Railroad & Co software, our own Railroad Operator, or write your own customized control program.

	16 inputs with a choice of filters, each read 9600 times per second
	Scanned input mode, which allows up to 512 input points (contact closures) to be attached to a single IO-48 card. Can be configured to scan from 8 to 512 inputs in groups of 8.
	A wide variety of output functions, including support for all types of model railroad signals, crossing flashers, turnout motors and solenoids, with variable brightness control.
	A variety of easy-to-use, plug-in options allow conversion of output points for common cathode signals, high-powered bridge (bi-directional) drivers, relay outputs, and throttle drivers. Up to 4 different output plug-ins can be used on one IO-48 card.
	Available Plug-in card (BD-8D) converts a bank of 8 input points to current sensing, optically isolated, block detectors. (External diodes required as sensing elements.) Switch-selectable holdover time included. Direct outputs to drive panel indicator lights or other circuitry without using IO-48 outputs.
	All inputs and outputs equipped with plug-in Molex connectors for ease of maintenance. Cards can be easily plugged and unplugged for easy swap-out.
	Optional plug-in screw terminals convert inputs and outputs to screw-down connections. Allow the plug-in capability of Molex connectors with the ease of installation of screw terminals. Also available are flexi-connectors, with built-in resistors for signals or slow-motion switch machines.
	On-card jumpers and switches select interface baud rate (19,200 or 38,400), card address (255 choices), and input polarity.
	All inputs and output circuitry is implemented with Integrated Circuits in sockets for simple  replacement in case of accidental damage .

The IO-48 is now available with a choice of electrical filtering on the inputs. "No Filters" should only be used on inputs attached directly to the BD-8 block detector card. "Light Filters" are suitable for most normal uses such as contact closures, pushbuttons, and optical detectors.  "Heavy Filters" may be required in an environment that is electrically very noisy or with very long wire runs to the inputs.  Also available without inputs for those uses where only 32 outputs are needed - this option is designated the "O-32" card, but is identical to the output section of the IO-48.