CAN Control
© 2019 EMP, Inc.
10
CAN Control
NOTE:
All cavities in the mating connector(s) must either be terminated
or plugged to prevent moisture from entering the component.
NOTE:
CAN wiring should follow guidelines found in SAE J1939-15.
Example CAN Application Schematic
Operation
EMP controllers with CAN support two J1939 command and status messaging options. Choices are EMP
Defined message format or SAE J1939 Standard message format. Command and status messages are
calibrated for each application.
R20C controllers expect to receive a command message at a 1 second rate. If this command is not received
within the calibrated timeout (default of 5 seconds) the controller will run at the calibrated default speed. The
controller can be commanded to a specific rpm or a percent of maximum rpm.
Each controller also supplies a status message at a 1 second rate. The status message supplies information
such as operation status, command status, service status, current rpm, power, and measured temperatures.
Exact message content depends on the calibrated message choice.
EMP Messages
The R20C supports a single EMP defined command message and one of two EMP defined status messages.
Full details of EMP messages are available in section 3 of
Component Controller CAN Communication
, EMP
document 9980001068.
Motor Status Message 1
Motor Status Message 1 is the original status message provided by EMP components. Support for this
message remains for backward-compatibility with existing system designs. EMP does not recommend use
of this message in new designs.
Pin Purpose
1 Battery power
2 Plugged
3 Address return (optional)
4 Address in (optional)
5 CAN Hi
6 Ignition enable
7 Plugged
8 Ground
9 Plugged
10 CAN Lo
