5 Commissioning and Operation
Kübler Group
26 - EN
HB J1939 - M3668/M3688, M3668R, M5868 - R67047.0002 - 02
This data must now be distributed over several CAN frames and transmitted per CMDT trans-
port protocol. The transport protocol is necessary because at the maximum 8 user data bytes
can be transmitted per CAN frame.
All mentioned CAN frames must be sent and received as extended frames (29-bit identifier).
There must be a dwell of at least 50 ms between the sending of the frames.
A CMDT connection must be set up first. The requesting control device has address 0x01 and
the sensor has address 0x20. The parameters coded in the sent packet are:
• Control byte: 0x10
• Message size: 0x15
• Total number of packets: 3
• Maximum number of packets: 0xFF
• PG number: 0xEF00
• Source address: 0x01
• Destination address: 0x20
For this purpose, the following RTS packet must be sent to the sensor and the CTS answer
from the sensor must be waited for:
Byte
0
Byte
1
Byte
2
Byte
3
Byte
4
Byte
5
Byte
6
Byte
7
Send RTS request on CAN ID:
0x18EC2001
10
15
00
03
FF
00
EF
00
Receive CTS answer on CAN ID:
0x18EC0120
11
03
01
FF
FF
00
EF
00
In the nest step, the control device sends the configuration data in three CAN frames to the
sensor.
It is visible that byte 0 of the frames always contains the sequence number in the data transmis-
sion. Bytes 1-7 consecutively contain the raw data. These are in this example:
04 00 00 40 00 00 00 00 00 10 32 00 00 00 01 00 00 00 00 01.
Byte
0
Byte
1
Byte
2
Byte
3
Byte
4
Byte
5
Byte
6
Byte
7
Send TP, sequence number:
1, CAN-ID: 0x18EB2001
01
04
00
00
40
00
00
00
Byte
0
Byte
1
Byte
2
Byte
3
Byte
4
Byte
5
Byte
6
Byte
7
Send TP, sequence number:
2, CAN-ID: 0x18EB2001
02
00
00
10
32
00
00
00
