... works as a multiplexer, and selects the appropriate pin for communication. PIN3, PIN7, PIN8, PIN12 = Serial Link (ISO9141, KW81, KW82, ... parameter simultaneously. The sample rate is depends mostly on the communication protocol. For example, older system, like Omega-B X 25 DT ... (ISO-9141-2) can be very slow, during communication, while newer Multec, or Bosch units are faster (using KWP-2000), and the ...