Wire KT LCD3 to TSDZ2 - OpenSourceEBike/TSDZ2_wiki GitHub Wiki

The KT-LCD3 is signal compatible with TSZD2 motor controller however it uses a different connector so you will need to manage the wiring connection yourself.

The simplest option is to cut your existing display cable at the display, and either splice it to the KT-LCD3 cable (easiest), or wire it directly to the KT-LCD3 board. Obviously this renders your original display useless without splicing its cable back together. If you want either throttle or brake sensor functions, you will also need to connect those components to wires in the original cable (the KT-LCD3 plays no part in those functions)

To avoid cutting your original display cable, you would need to find the source of Higo Mini-A dimension connector

The KT-LCD3 kit comes with an extension cable with plug, ready to be spliced. KT-LCD3 connectors looks like Higo mini-B Z209, available from EBike Technologies.

TSZD2 motors models are sold with or without a throttle connection. The cable that goes from the motor controller to LCD is different and here are the details -- you need to identify your cable signals (use a multimeter to measure between GND and P+ battery voltage):

6 pin controller (usually this is a TSDZ2 without throttle):

wire color function description
green P+ battery voltage
black GND ground
white Vin ground when LCD disabled and P+ (battery voltage) when LCD is enabled
brown UART TX motor controller sends digital data to LCD
orange UART RX motor controller receives digital data to LCD
purple brake this signal is active low, meaning that when brakes are not active, this wire has 5V and with brakes active this wire has 0 volts.
Leave this wire unconnected if you will not be using brake sensors.

8 pin controller (usually this is a TSDZ2 with throttle):

wire color function description
blue P+ battery voltage
black GND ground
red Vin ground when LCD disabled and P+ (battery voltage) when LCD is enabled
brown UART TX motor controller sends digital data to LCD
yellow UART RX motor controller receives digital data to LCD
green brake this signal is active low, meaning that when brakes are not active, this wire has 5V and with brakes active this wire has 0 volts. Wired with the 5V wire and black GND wire for 3 pin throttle.
Leave this wire unconnected if you will not be using brake sensors.
white 5V
orange throttle wired with the 5V wire and black ground wire for 3 pin throttle

Summary of connections between KT-LCD3, Bafang 850C and TSDZ2 motor cable

KT-LCD3 wire color 6 wire color (no throttle) 8 wire color (throttle) TSDZ2 controller wire function
red green blue (P+) battery voltage
blue white red Vin
black black black GND ground
green brown brown UART TX motor controller
yellow orange yellow UART RX motor controller
na purple green Use with brakes
na na orange Use with throttle
na na white For hidden brakes and throttle
You can wire the brakes to brake wire and you will also need to wire the GND wire. If you are using a “hidden wire brake sensor”, you will also need to connect the 5V wire.

For the throttle, you will need to connect the throttle wire, the GND and 5V wire.

Some example of soldering wires :

(nb. Correct way is to stagger the cuts so that they would not short even without heatshrink, this makes a small neat bundle)

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