Absolute Optical Inclinometer Page 1 of 5 The A2T is a single axis, digital gravity angle sensor. The A2T serves as a full 360 range absolute tilt sensing programmable level with either digital or analog output. Internally, a rotary bar coded disk is mounted to a weighted gravity driven wheel. A micro-controller strobes an LED to transfer the bar code image onto an optical linear array which decodes the tilt angle. Magnetic damping provides fast response and settling time. An internal EEPROM stores field programmable parameters such as resolution, zero position, direction swap, and mode. The A2T communicates over a RS485 style serial bus utilizing US Digital's SEI (Serial Encoder Interface) which allows for simple, quick and convenient networking of multiple SEI devices on a single network. PLCs, motion controllers and computers can also reside on the SEI bus as well by use of US Digital's SEI to USB interface device. For complete information about the SEI bus please refer to the SEI Communications Protocol webpage. Cable CA-MD6A--SS--MD6 and the SEI-USB can be used to interface the A2T to a USB port. The A2T is also available with an optional analog output. The analog output option provides a maximum voltage range of 0 to 4.095 volts with 12 bit resolution. The output voltage can be scaled by simple SEI commands to provide user defined voltage ranges. From the factory the analog output voltage is set to 0 to 3.599 VDC range. Please note that with the A2T analog output option only one device may reside on a SEI bus. Typical applications include heavy construction equipment, dredging machinery, mining equipment, solar tracking and warehouse automation. ► 12-bit accuracy and resolution field programmable from 2 to 4096 codes per revolution (3600 factory default) ► Full 360 degrees range, 7 msec update time ► Low power drain of 18.5 mA max., and 2.5 mA in sleep mode ► Field programmable parameters such as setting zero position point (free demo software provided) ► EEPROM stores downloadable parameters ► 9600 baud default data rate adjustable up to 115K baud ► 12-bit analog voltage output option (0 to +3.599 volts factory default setting. Field progammable up to 0 to +4.095 volts) ► Multi-turn mode (note: power must be maintained to prevent reset to zero) ► -25 to 70 degrees C. operating temperature ► Simple, low cost Mechanical Drawing USE= 1400 NE 136th Avenue [email protected] Local: 360.260.2468 DIGITAL Vancouver, Washington 98684, USA www.usdigital.com Toll-free: 800.736.0194

Absolute Optical Inclinometer Page 2 of 5 Parameter Value Units Operating Temperature Vibration (5Hz to 2kHz) Electrostatic Discharge, IEC 61000-4-2 0 Mechanical Parameter Settling Time Pendulum Undamped Natural Frequency Weight & Damping USE= 1400 NE 136th Avenue [email protected] Local: 360.260.2468 DIGITAL Vancouver, Washington 98684, USA www.usdigital.com Toll-free: 800.736.0194

Absolute Optical InclinometerPage 3 of 5 Damping affects settling time and overshoot. Standard damping will fit most applications. Double damping eliminates oscillation but s ettles to the final position more slowly. Some applications may require double damping to average out cyclic motion such as found in m oving vehicles. Damping options can be specified when ordering. ^ Electrical ► Specifications apply over entire operating temperature range. ► Typical values are specified at Vcc = 12V and 25C. Parameter Min. Typ. Supply Current @ 12V supply Active 14 Analog Output Impedance 51 Zero Scale...

Absolute Optical Inclinometer Page 4 of 5 (1) The internal microcontroller takes a snapshot of the disk every 7 msec. and stores the position in memory. It responds immediately to a "report position request" by sending the most recently computed position. Parameter Default value Volatile? Origin offset 0 Non-volatile Baud rate 9600 Volatile (1) Mode is always restored from non-volatile EEPROM on power-up; however, there are separate SEI commands for setting the RAM copy only, or both the RAM copy and the non-volatile EEPROM copy. For an explanation of the Mode bits, seeSEI Absolute Encoder Communications...

usa= AOTDIGITAL I Absolute Optical Inclinometer Page 5 of 5 ^ Ordering Information A2T -_ Interface S =Default - SEI Bus A =Analog output are not included and must be ordered separately. ► US Digital® w arrants its products against defects in materials and workmanship for two years. See complete warranty for details. S = Default-Standard damping D =Default-Not sealed D =Double damping USE= 1400 NE 136th Avenue [email protected] Local: 360.260.2468 DIGITAL Vancouver, Washington 98684, USA www.usdigital.com Toll-free: 800.736.0194