Ultralight N17 R1.5 - Wiring & Jumpers

2025-09-21 · Ben @ Mettle & Byte

What’s Included
What You’ll Need
Jumper Configuration

What’s Included

1  x Mettle & Byte Ultralight N17, R1.5
1  x 70mm Motor Cable XH 2.5 to PH 2.0 (crimped, install correct connector for your motor)
1  x Valcon PH 2.0 connector, 6 pin
1  x Valcon PH 2.0 connector, 4 pin
1  x Valcon PH 2.0 connector, 3 pin
1  x Valcon PH 2.0 connector, 2 pin
1  x Valcon XH 2.5 connector, 4 pin
5  x Jumpers, 2.0 pitch, 2 pin
10 x Valcon PH 2.0 crimps

What You’ll Need

3D Printed parts shown in product images are not included, but the models are available for free on Printables (see Mounting).

Required:

NEMA17 bipolar stepper motor (4 wire)
XT30 2+2 cable - we recommend the Mellow Fly CAN Cable

Optional:

Fan for active cooling at higher current limits (must match your chosen IO voltage: 5v, 12v or 24v)
Endstop switch (must match your chosen IO voltage)
Gdstime 3010, 24v fan with PH 2.0 connector is perfect for active cooling

Note

Right angle XT30 2+2 cables are probably not compatible with our fan mount due to insufficient clearance for the cable lip.

Jumper Configuration

Properly configuring your jumpers is essential for correct operation.

Header	Function	Configuration
`NPN`	Endstop Input Type	Install a jumper to configure the `STOP` input for NPN-style (sinking) endstops. Leave the jumper off for PNP (sourcing) endstops.
`VIO`	IO Output Voltage	Install a jumper between 5v, 12v or VIN and one of the output pins to set the IO voltage. Applies to `STOP` and `AUX`. ONE JUMPER ONLY!
`CAN`	CAN Bus Source	Switches between hardware (RRF) or software (Klipper / custom) CAN control. Install two horizontal jumpers facing inwards from the H mark for RRF, or two jumpers facing inwards from the S mark for Klipper / custom.
`TERM`	CAN Bus Termination	Install jumper to terminate the CAN bus with 2 x 60Ω resistors if this device is the end of the bus.

Driver Communication Mode (UART vs. SPI)

The TMC2240 driver can be controlled via UART or SPI.

Default Mode (UART): For maximum compatibility, the board defaults to UART mode. In your firmware, you only need to define the UART pin for the TMC2240, which is connected to GPIO1 of the RP2350.
Enabling SPI Mode: To use the faster SPI interface, you must configure GPIO29 in your firmware. During your firmware’s startup sequence, drive GPIO29 LOW. This will switch the TMC2240 into SPI mode before any communication attempts are made.

For detailed pinout information, see the Pinout Reference.

← Back to Ultralight N17 R1.5

Contents

What’s Included

What You’ll Need

Jumper Configuration

Driver Communication Mode (UART vs. SPI)