Sevcon Dragon8 - I-Protocol; J1939 Compatibility

System design
Doc. # 177/52705
Rev. 1.0
47
HS4
Fault Information
72448
0x11b00
HS5
Encoder Information
72704
0x11c00
HD1
Debug Currents
75776
0x12800
HD2
Debug Voltages
76032
0x12900
HD3
Debug Temperatures A
76288
0x12a00
HD4
Debug Temperatures B
76544
0x12b00
HD5
Debug Control PMAC
76800
0x12c00
HD6
Debug Control FV
77056
0x12d00
Table 17 - Default H-protocol PGN configuration
Further details regarding the layout of signals within these messages is available from Sevcon on
request.
If a VCU is not available to generate motor control demands in H-Protocol format, TracApp can be used
instead.
H-Protocol includes an integrated timeout feature. If the motor controller does not receive H-Protocol
commands for a specified timeout period, the motor will automatically output zero torque, and will also
attempt to report this condition to the controlling device.
I-Protocol
I-Protocol works alongside H-Protocol to allow monitoring and provide control of digital and analogue
input and output devices.
I-Protocol allows a VCU to control:
• Digital outputs
• Analogue outputs (contactor drives)
I-Protocol allows a VCU to monitor:
• State of digital inputs
• Analogue input voltages
• Fault codes
J1939 Compatibility
Like H-Protocol, I-Protocol is intended to be compatible with J1939, and communicates using PDU1
type PGNs. The PGNs used by the IO controller can be configured in the Object Dictionary at index
3F01h. However, the default PGNs listed below should be used if possible:
Name
Description
PGN (dec)
PGN (hex)