TANDELTA OQSExISG2, Руководство пользователя

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12.1.5 Digital Data
When not used with a Tan Delta preparatory display or gateway solution, the sensor can be
configured to communicate by a number of different communication protocols:
Tan Delta Protocol on RS485
CAN Open on CANbus
Modbus RTU on RS485
J1939 on CANbus
For full details of all of these communication protocols, please refer to section 11 of this
manual or contact Tan Delta Support for further assistance.
12.1.5.1 J1939 on CANbus
J1939 is commonly used on data logger equipment. Raw data may be presented with a variety
of header detail associated to the CAN logging device you are using. This is not needed for
interpreting the data.
CAN data will be returned in a format similar to as shown below (example is from a J1939 data
logger on CANbus):
Figure 63 - Example Raw CAN Data
Plain text can be imported into a spreadsheet to process as shown:
Figure 64 - Example Raw CAN Data (2)
Data ID of 18feff85 represents the TDN value, whilst data ID of 18feee85 represents the
temperature value returned from the sensor.
The following formulae may be useful to use on the data (column 4 in the example) in a
spreadsheet to turn the raw J1939 CAN data into a useable number for reporting or graphing:
For 18feff85 (TDN) values: =HEX2DEC(MID( D2 ,11,2))*10
For 18feee85 (Temperature) values: =HEX2DEC(MID( D1 ,7,2)&MID(D2,5,2))-30
Once converted into useable data, the values can be plotted as per the instructions provided in
11.7.
(Note, “ D2 ” refers to the cell reference containing the data)
Column1 Column2 Column3 Column4
2022-03-01 08:49:54.765 1 18feee85 ffff4000ffffffff
2022-03-01 08:49:54.765 1 18feff85 ffffffffff1c39ff
2022-03-01 08:50:05.989 1 18feee85 ffff4000ffffffff
2022-03-01 08:50:05.990 1 18feff85 ffffffffff1c39ff