High Country Tek epc, Electronic Pump Controller - A Multi-Function SAE J1939 Compatible Module - Manual (Page 39)

023-00354-Rev1.6 evc/epc User Manual 39
Copyright © High Country Tek, Inc. – 2013
evc/epc Controller
With SAE J1939 Interface
SAE J1939 CAN Bus
The evc/epc can be controlled by messages received over the SAE J1939 Bus.
The EEC1 (PGN: 61444 SA: 0) engine RPM (SPN: 190) can be monitored for use in anti-stall and closed loop
operations.
The proprietary SAE J1939 Command Message (PGN: 65281 through 65407 SA: 34) can be monitored for Coil A,
Coil B and RPM Set points for various operation modes. This address is adjusted based on the Module ID. The
relationship of the Module ID and the Command Message address is defined in a chart at the end of this section.
The evc/epc can transmit its status over the SAE J1939 Bus.
The proprietary SAE J1939 Status Message (PGN: 65409 through 65535 SA: 34) is a multiplexed message with
the first data byte indicating message 1 Status or message 2 Analog Values. This address is adjusted based on the
Module ID. The relationship of the Module ID and the Status Message address is defined in a chart at the end of
this section. When the SAE J1939 Command Message is enabled, the Status Message will be transmitted. If
Report Analog Values is enabled on the SAE J1939 tab, the Analog Values will be transmitted. The content of the
Status and Analog Values messages are detailed below.
Command Message Format
Transmission Repetition 40mS
Data Length 8
Data Page 0
PDU Format 255
PDU Specific Module ID #
Priority N/A
Parameter Group Number 65281 Through 65407 (FF01 Through FF7F)
Start Position Length Parameter Name
1 1 Byte Always = 1
2-3 2 Bytes Coil A Set point
4-5 2 Bytes Coil B Set point
6-7 2 Bytes RPM Set point