ROUNDSS absolute encoders provide multiple output interfaces:RS485, RS422, RS232,SSI, BISS MODBUS and CANopen,the max resolution up to 33 bit and operating voltage is DC5V and DC9V-30V. The absolute encoders pass the certification is CE ISO9001 & ROHS.The Manufacturer of sensor has high quality control, better delivery control and better cost control. For other types of cheap absolute encoders, please contact sales for details.