Two modules have been added to Tidal Engineering's ADAIO family of precision analog I/O expansion solutions for embedded applications. These compact and versatile microcontroller-based devices provide both analog input and output, and employ the I2C Bus (Inter-Integrated Circuit). The TE 1313 and TE 1243 modules provide one digital-to-analog output channel with resolutions of 16 bits and 12 bits respectively, and one 16-bit bipolar/unipolar analog-to-digital input channel with an input range from 0.1 to ±10 Vdc. Providing industrial 1/0 with modular flexibility, devices boast a 73 (L) x 19 (W) x 18 mm (H) space-saving design. The units are specifically engineered to mount directly to Tidal's full line of embedded IEEE 488 single board computers, enhancing their I/O capability. Most commonly used with Tidal's SBC448A to provide a flexible instrument development platform, modules are equally suitable as standalone devices in a wide range of data acquisition and measurement applications including signal measurement and process control. The TE 1313 and TE 1243 provide optically isolated data, with up to 1000 V of optical isolation, and an onboard DC/DC converter to eliminate the need for a second isolated power. Their DAC Full Scale (FS) output range is selectable for 1.0 Vfs, 5.0 Vfs and 10.0 Vdc, while the units&apostrophe; microcontrollers provide median filtering for the ADC. Conversion time is a fast 4 milliseconds. Tidal Engineering Corp, 2 Emery Avenue, Randolph NJ 07869, USA, Tel: +1-973-3281181, Fax: +1-973-3282302.