2020-08-26 GCU7 Manual
I. GENERAL OPERATING GUIDE
-In order to shift from Neutral to 1st, you need to press clutch + N/R button + paddle up. Clutch
and N/R checking can be deactivated in the software, but we do not recommend it. There’s
always a chance that someone would accidently touch the paddle while the car is running,
causing the car to start driving without driver control.
-Similarly, when shifting from 1st to Neutral (or Neutral to Reverse), you need to press clutch +
N/R button + paddle down. Again, Clutch and N/R button can be deactivated in the software.
-In H pattern mode, pressing the clutch + N/R button for 3 seconds restores the gear to neutral
from any position (even if invalid)
-For H pattern, synchromesh mode (with clutch actuator), to shift from neutral to 1st, you need to
press brake and shift up. When you release the brake, car will start moving.
II. CONNECTING TO THE GCU
GCU7 uses CAN BUS to connect to the computer so special interface is needed.
GCU Interface uses FTDI drivers which are usually already installed by default. If you’re having detecting
USB device, go to FTDI site and download the VCP drivers for your OS.
If you have USB CAN 3 and GCU with LED diode (on the side), you don't need to do anything else. CAN
Interface port is high speed (CAN FD) and is already terminated so you just need to connect the
connector.
For GCU without the LED connector, follow the instructions below:
Each CAN BUS must be properly terminated (by 100-120 ohm resistor) on each side.
If you’re connecting to a car that already has a CAN BUS, nothing is really needed, because your CAN
BUS is already properly terminated. You just need to connect the CAN+ and CAN- to existing line and
that’s it.
If your car does not have CAN BUS or you’re only connecting the GCU7 on a test bench, you need to
insert a jumper in the GCU interface to successfully connect to the GCU.
