· 8 Relay Outputs 5A 250VAC
· 4 Opto-Isolated Inputs 5-30VDC
· 3 Analog Inputs (10 bit)
· Connections via Pluggable Screw Terminals
· 0-5V or 0-20mA Analog Inputs, Jumper Selectable
· 5A Relay Switching
· Power Indicator LED
· All enclosed in Professional looking plastic case
· Arduino Compatible
· Accepts Arduino Shields (Ethernet / XBEE)
· USB Virtual COM or RS485 Input
· Easily connect multiple units far apart by RS485

The KTA-223 is a USB or RS485 controlled IO module for interfacing PCs to real world applications, such as controlling lights and sprinkler systems, reading sensors and monitoring switches and other digital signals.
The Relays are capable of switching up to 5A at 250VAC, 10A at 120VAC and 10A at 24VDC but the PCB tracks will only handle up to about 5A.

A simple ASCII protocol allows control from Windows/Mac/Linux using either USB Virtual COM drivers or RS485.

Additionally, multiple devices can be connected to one RS485 bus, allowing control of many devices from one USB port.

The controller is based on the hardware of the Arduino physical computing controllers.
It can be programmed as a stand-alone controller using the free, open source Arduino environment.
Internally, the controller is shieldcompatible, allowing the use of many extension boards designed for the Arduino Deumilanove.
As shipped the controller is loaded with a sketch that receives simple commands over the USB or RS485 serial port and switches relays or responds with the status of inputs.
This sketch is available on the Ocean Controls website as an example of Arduino programming for the controller.
Multiple controllers can be connected to one or more PCs in an RS485 network.
Each controller can be assigned an address and will respond to commands addressed to them.

Specifications
Power Supply V+ and COM:
KTA-223: 9-16V DC (12V Nominal) ~200mA + External 5V drain
KTB-223: 18-32V DC (24V Nominal) ~200mA + External 5V drain
Analog Input ANx:
0-5V: ~500k effective resistance with © no jumper installed
0-20mA: ~250 ohms effective resistance with jumper installed
Opto-Isolated Input: 0-30V, ~1k ohms effective resistance
Relay Outputs: SPDT relays rated to 5A (resistive). 250VAC / 30VDC
5V Auxiliary Supply 5V: 200mA