Recent content by abol_fa

  1. A

    (IEC 60870) what is the correct response when receiving invalid COT or CA or IOA values.

    Let's say a station has the common address of 200 and a master sends an ASDU (interrogation/read etc...) to it that has the CA of 150. this would mean that this ASDU is not meant for the station (it has an invalid/unknown value for the station) and the station should respond with a COT of 47
  2. A

    (IEC 60870) what is the correct response when receiving invalid COT or CA or IOA values.

    Thanks for the answer but: SQ bit specifies how information objects are addressed in an ASDU but does not tell which information objects should be included in case an ASDU with invalid CA/COT/IOA arrives. In this case we have to tell the controlling station that the request it sent is invalid...
  3. A

    (IEC 60870) what is the correct response when receiving invalid COT or CA or IOA values.

    i get that. assuming that I'm the device, i have to reply with an asdu with cot of 47. but i also have to include at least one information object in my asdu as the standard states. what information object would that be?
  4. A

    (IEC 60870) what is the correct response when receiving invalid COT or CA or IOA values.

    When a device receives an ASDU with an unknown COT or CA or IOA value what type of Information Object should be included in the response? I know that the response COT could have one of these values : COT=44 COT=45 COT=46 unknown type identification unknown cause of transmission unknown...
See more
Top