Profile: Greenwich Instruments Ltd. specializes in laboratory test equipment. Our product line includes RS232 to fiber, high speed USB fiber, unipolar stepper motor driver, balanced line RS232 extender and RS232 to RS422 line driver. Our range of RS232 to fiber converters include both plastic and glass fibers, capable of transmitting up to 100m (plastic) and 8km (glass). They both offer fast setup times and come with an external power supply. Our GOUSB offers compatibility with our existing GO232 products, our USB version is powered from the USB and boasts a transmission distance of 8km and data rates up to 2Mb/s. Our GW132 is designed to overcome the standard limitations for RS232 over distance. They are powered via the serial port and can transmit up to 500 meters.