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Using the Programming Cable
HV must NOT be present at the inverter when in programming mode!
With the Control Board mounted inside the inverter cover, direct physical access for programming or firmware updates is not
possible. Some means for communicating with the Control Board is necessary and this was accomplished by re-purposing the
original encoder A & B signal input circuits to also act as the serial communication interface (SCI). The main LDU harness has a
connection break in the encoder branch that allows for SCI connection. This is where the programming cable is plugged in to
interface with the control board.
Along with the encoder A & B circuits, the programming cable also makes use of the encoder sensor ground and 5v circuits. In the
encoder branch of the main LDU harness is the Program Enable circuit. If Program Enable is put to ground, the Control Board will
go into programming mode and is readied to receive firmware. If Program Enable is put to 5v, the Control Board will go into GUI
mode to allow parameter changes using RMS GUI software. The programming cable has a switch built into it to toggle between
ground for programming mode or 5v for GUI mode.
PROGRAMMING MODE
Point switch towards PURPLE wire for
PROGRAMMING mode.
GUI MODE
Point switch towards GREEN wire for GUI mode.
When putting the Control Board into programming mode, the programming cable switch should be put to PURPLE and the
inverter must be power cycled before programming mode will be active.
AEM Performance Electronics
2205 W 126th Street, Unit A
Hawthorne, CA 90250
Page 19 of 23
Phone (8am-5pm M-F PST): 310-484-2322
Fax: 310-484-0152
sales@aemev.com
tech@aemev.com
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