Terminals
There are 5 screw terminals on the top of the unit which are for the motor phase wires and the battery.
| U | Motor phase wire U (Green) |
| + | Battery positive (36-72v) |
| V | Motor phase wire V (Yellow) |
| – | Battery negative |
| W | Phase Wire W (Blue) |
Molex Connectors
There are a pair of Molex connectors on the right hand side of the unit 1 x 16-pin MX150 and 1 x 6-pin MX150.
CON 1: 16-pin Molex MX150
| Pin # | Function | I/O Details | Continuous Current | Withstand Voltage | Notes |
|---|---|---|---|---|---|
| 1 | HDQ | Low-side Switch | 100 mA | 57 V | |
| 2 | Cruise | 5V Pulled-up, active low | 100 V | ||
| 3 | TTL-TX | 5V TTL | 9 V | ||
| 4 | 5V output | Polyfuse protected | 50 mA Shared | Shared output | |
| 5 | PFS | 5V Pulled-up, active low | 100 V | ||
| 6 | Brake 1 | 0-5V, Configurable 5V pull-up | 5.5 V | ||
| 7 | Throttle | 0-5V Pulled down | 5.5 V | ||
| 8 | 5V Output | Polyfuse protected | 50 mA Shared | Shared output | |
| 9 | Key In / Ignition | Connect to Battery positive to power on | 400 mA | 95 V | Requires B+ out connection, may draw up to 100 mA |
| 10 | CAN-L | 5V CAN | 20 V | Configurable 120 Ω termination resistor | |
| 11 | CAN-H | 5V CAN | 20 V | Configurable 120 Ω termination resistor | |
| 12 | ABMS | 0-10V Pulled down | 11.5 V | ||
| 13 | TTL-RX | 5V TTL | 9 V | ||
| 14 | Signal GND | 400 mA shared | 400 mA max shared with all GNDs | ||
| 15 | Signal GND | 400 mA shared | 400 mA max shared with all GNDs | ||
| 16 | 12V Output | Polyfuse protected | 50 mA | 47.5 V |
CON 2: 6-pin Molex MX150 (Hall Sensors)
| Pin # | Function | I/O Details | Continuous Current | Withstand Voltage | Notes |
|---|---|---|---|---|---|
| 1 | Hall 5V | 100 mA | 47.5 V | ||
| 2 | Hall GND | Polyfuse protected | 100 mA | ||
| 3 | Hall A | 5V Pulled-up, active low | 100 V | ||
| 4 | Hall B | 5V Pulled-up, active low | 100 V | ||
| 5 | Hall C | 5V Pulled-up, active low | 100 V | ||
| 6 | Brake 2 | 0-5V, Configurable 5V pull-up | 5.5 V |
Programming
Programming the BAC controller is done with the ASI BACDoor PC Suite (which can be found here if you look carefully) via. a cheap CP2102 USB-TTL dongle (available on eBay or Amazon).
NOTE: COM port baud-rate is 115200.
The important pins on the 16pin connector for programming as as follows:
| PIN | FUNCTION |
| PIN 3 | TTL-TX |
| PIN 9 | Power / Ignition |
| PIN 13 | TTL-RX |
| PIN 14 | Ground |
NOTE: The ignition pin needs to be connected to the battery positive but be VERY VERY VERY VERY careful that you do not accidently touch another pin because you’ll cook your controller!