John Morris
Lifetime Supporting Member
Good afternoon all
I am have a difficult time trying to cross what is written in my program of which the origins were Rockwell engineers.
Specifically Cat engine hours. J1939 Data_In_[12] and J1939 Data_In_[13]
The latter [13] is used in a BTD function. Source bit is 0. destination is "Engine Hours Upper Shifted". Destination bit is 15, length is 15. The former, [12] is used in a Bitwise inclusive OR function. Source A is Data [12], source B is the "Engine Hours Upper Shifted" and a destination of "Engine Hours Raw" Run thru a CPT function *.05
Three of older units are not clocking the engine hours after (in the neighborhood of) 3300 hours. In the J1939 register for [13] there is a "1". in the working units there is a "0". I do not understand the significance.
A dozen web sites call engine hours 18FEE500. Another dozen PGN:65253
I have no way to discern what J1939 [13] is and what is the significance of the "1" or "0". I believe strongly the engine hours is the data [12].
Any help understanding this and what might be the solution would be greatly appreciated.
I have snips of working and non working units if need be
Thank you for your time
I am have a difficult time trying to cross what is written in my program of which the origins were Rockwell engineers.
Specifically Cat engine hours. J1939 Data_In_[12] and J1939 Data_In_[13]
The latter [13] is used in a BTD function. Source bit is 0. destination is "Engine Hours Upper Shifted". Destination bit is 15, length is 15. The former, [12] is used in a Bitwise inclusive OR function. Source A is Data [12], source B is the "Engine Hours Upper Shifted" and a destination of "Engine Hours Raw" Run thru a CPT function *.05
Three of older units are not clocking the engine hours after (in the neighborhood of) 3300 hours. In the J1939 register for [13] there is a "1". in the working units there is a "0". I do not understand the significance.
A dozen web sites call engine hours 18FEE500. Another dozen PGN:65253
I have no way to discern what J1939 [13] is and what is the significance of the "1" or "0". I believe strongly the engine hours is the data [12].
Any help understanding this and what might be the solution would be greatly appreciated.
I have snips of working and non working units if need be
Thank you for your time