Detailed Product Description Passive direct read type gas meter techinical specificationsTechnical Function:1,the system of ... digits are the centralized recorder code.6,the type of communication:half-duplex type.Technical Specifications:1,joint:RS485GMSGPRSInfrared rays2,data ... T645-19975,power supply:DC12V±10%6,passive direct read type gas meter input electric current≤10mm Centralized recorder input ...