2 simple can data transmission, Simple can data transmission – Campbell Scientific SDM-CAN Datalogger to CANbus Interface User Manual
Page 38
SDM-CAN Datalogger-to-CANbus Interface
1: SDM-CAN (P118)
1: 0
SDM
Address
2: 4
Time
Quanta
3: 5
Tseg1
4: 2
Tseg2
5: 1024
ID Bits 0..10 (-- for 11-bit CAN ID)
6: 7680
ID
Bits
11..23
7: 12
ID
Bits
24..28
8: 2
Rx, unsigned int, LSB 1st
9: 33
Start
Bit
No.
10: 16
No.
of
Bits
11: 1
No.
of
Values
12: 1
Loc [ Eng_Spd ]
13: 0.125
Mult
14: 0.0
Offset
*Table 2 Program
02: 0.0000 Execution
Interval
(seconds)
*Table 3 Subroutines
End Program
The above example uses the J1939 standard to define the ID
parameter and value position in the data frame. Please refer to
Appendix C, Application of the SDM-CAN on Networks
Complying with the J1939 SAE Standards, for an explanation of
the application of the SDM-CAN interface to networks
complying to the J1939 standard.
NOTE
3.5.2 Simple CAN Data Transmission
The following example transmits a 16 bit temperature value to a CAN network
running at 500K baud.
;{CR10X}
;
*Table 1 Program
01: 1
Execution
Interval
(seconds)
;When Flag 1 is high set SDM-CAN switches to transmit mode
1: If Flag/Port (P91)
1: 11
Do if Flag 1 is High
2: 30
Then
Do
;Load input location with value for switches
6: Z=F (P30)
1: 0003
F
2: 0
Exponent
of
10
3: 3
Z Loc [ Switches ]
30