this lightweight din rail mountable unit, line driver and line receiver, comes in a stylish green pc/abs self-extinguishing material blend. it is configurable as a level changer, line repeater, splitter or encoder tester. the rx/txd will accept ttl, rs422, rs485, pp, npn, npn oc, or pnp encoder inputs at 5v, or htl, pp, npn, npn oc & pnp at 5v-24v. it will provide up to 3 outputs in any combination of ttl, rs422, rs485, pp, npn or pnp, at 5v, or, htl, pp, npn or pnp at 6-28v. a series of leds on the front panel indicates power and signal presence. connections are made via the easily accessible screw terminals as standard. this device may be used as both a line driver and line receiver.