Interfaces
DUELink modules are designed to be versatile and dynamic, with multiple interface options.
Uplink
Every single DUELink module works with USB, I2C, and UART on their Uplink connector. This common JST connector is marked with U and is off-white color.

The first use of Uplink connector is to connect DUELink modules to a Supported Hardware.

Another option is to use Uplink to daisylink DUELink modules.

Note that some modules are made in a microcomputer-form-factor and the Uplink connector is replaced with a USB connector, which can only use the USB interface.

Learn more about USB, I2C, and UART interfaces.
Downlink
The Downlink socket is marked with D and it is blue color. It is automatically handled by the internal engine and allows for Daisylinking modules.

Learn more about Downlink.
Wireless
DUELink doesn't stop there as it also provides ways for connecting modules over a wireless connection.

Connector Orientation
Both U and D JST connectors are keyed to prevent from wrong orientation use. Do not try to force in the connector with the wrong orientation!

Doing so will may cause the internal pins to be bent. If happened, the bent pins can be corrected using a tiny screwdriver.
