Product Details  R-8018ID/R-8018ID+ R-8018BL with dialing number on-off to set up address R-8018BL with dialing number on-off to set up address Main Features: - Set up module station address by dialing number on-off - Be convenient to repair and replace on the spot - Others same as R-8018BL - With Modbus communication protocol (R-8018ID+)