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https://www.enovationcontrols.com/pvforumarchive/viewtopic8cec.html?t=1114
Devices are required (according to the J1939 standard) to respond when a request comes to their address. At the very least a NACK. Some devices only respond to requests to their address. So, if you don't get the engine hours, you can look at the data …
http://www.copperhilltechnologies.com/electronic-logging-devices-eld-sae-j1939-and-sae-j1708j1587-parameters/
Engine Hours. SAE J1939: PGN 65253 Engine Hours, Revolutions 4 Bytes, Pos. 1 – 4 – Engine Hours – 1 h/bit Message Frequency: On Request; SAE J1708/j1587: PID 247: Total Engine Hours 4 Bytes – 0.05h/bit Message Frequency: On Request; Vehicle Identification Number (VIN) SAE J1939: PGN 65260 Vehicle Identification Variable length, for ...
https://www.csselectronics.com/pages/j1939-explained-simple-intro-tutorial
J1939 request messages. Most J1939 messages are broadcast via the CAN bus, but some are only sent "on-request" (e.g. when polled by a J1939 data logger). On-request data often includes J1939 diagnostic trouble codes (DTCs), making it important in vehicle diagnostics. Below we briefly outline how it works:
https://canlogger.csselectronics.com/canedge-getting-started/record-data/j1939-data/
Log J1939 on-request data ¶. In some cases, you may wish to log on-request J1939 data. To do so, you’ll need to transmit the relevant J1939 request frame into the CAN bus - see also our J1939 simple intro.. An example is PGN 65253 (FEE5) which contains the SPN Engine Hours.Below we show what the transmit message could look like for this particular PGN.
https://www.auto-maskin.com/wp-content/uploads/2016/02/DCU-305-R3-CAN_J1939-manual.pdf
CAN / J1939 Manual CAN / J1939 – DCU 305 R3 9 Engine Hours If “Total Engine Hours” is selected as J1939 (CAN) in Rudolf, the DCU will read the value from the engine controller and make it available in a separate view. Battery Voltage If “Start Batter Voltage” is J1939 (CAN) in Rudolf, the range for the bar graph is zero to 50 volts.
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