AE-OPT-483 provides two low speed (up to 25Hz) counter inputs (Up and Down) for the AE series of process indicator displays. It is available in 2, 3, 4, 5, and 6 digit versions with digit sizes ranging from 1-inch high to 12-inch high. Standard signal inputs include dry contacts from limit switches, proximity detectors, or relays, DC voltage signals from PLC's, TTL outputs (NPN or PNP) from instruments and detectors and AC voltage signals from PLC's or other control equipment. The opto-isolated inputs allow the controls to be up to 1000ft away from the display.