DIP Switch - Spider IoT (HW ≥3.5)

The Spider IoT v3.5+ has a 4-position DIP switch. Each switch connects or disconnects a connector terminal from a microcontroller pin: none of them enables or disables features in software.

What each switch does

Switch	ON	OFF
DIP 1	IN03/CANL terminal connected to the IN03 / 1-Wire pin	IN03 disconnected (terminal left as CAN-L only)
DIP 2	IN01/XP01 terminal connected to the IN03 / 1-Wire pin	IN01/XP01 disconnected from 1-Wire
DIP 3	IN01/XP01 terminal connected to the IN01 input (voltage reading)	IN01 is not read
DIP 4	120 Ω termination between CAN-H and CAN-L	No termination

IN03 and 1-Wire are the SAME microcontroller pin. DIP 1 and DIP 2 are two paths to that single pin: DIP 1 routes it to the IN03/CANL terminal, DIP 2 to the IN01/XP01 terminal. When a 1-Wire sensor is in use, IN03 reads the bus.

Quick Reference

DIP 1	DIP 2	DIP 3	DIP 4	Configuration
OFF	OFF	ON	OFF	Standard: IN01 as input, no CAN termination
OFF	OFF	ON	ON	Standard + CAN termination
OFF	ON	OFF	OFF	1-Wire on the IN01/XP01 terminal (iButton, temperature sensor)
OFF	ON	OFF	ON	1-Wire on IN01/XP01 + CAN termination
ON	OFF	ON	OFF	1-Wire / IN03 on the IN03/CANL terminal — only if CAN is not wired

Combinations to avoid

Combination	Problem
DIP 1 + DIP 2 both ON	Shorts the IN03/CANL terminal to the IN01/XP01 terminal
DIP 2 + DIP 3 both ON	The input divider (100 kΩ) loads the 1-Wire bus and degrades communication
DIP 1 ON with CAN wired	The microcontroller pin hangs off the CAN-L differential line

CAN bus

The DIP switch does not enable or disable CAN. The transceiver is turned on and off by firmware, through the CAN configuration commands. All DIP 4 does is add the 120 Ω termination resistor.

Termination (DIP 4): only activate if the device sits at one end of the bus.
CAN-L shares its terminal with IN03: if CAN is wired, leave DIP 1 OFF.

XP01 output

XP01 does not go through any DIP switch. The open-drain output is permanently connected to the IN01/XP01 terminal. If that terminal is used as an input (DIP 3) or as 1-Wire (DIP 2), XP01 must stay off: activating it pulls the terminal to ground.

Voltage levels

IN03 and 1-Wire run at 3.3 V. They only have a 3.6 V protection clamp — do not apply vehicle voltage (12 V / 24 V) to those terminals.

The pin carries a 1 kΩ pull-up to 3.3 V, so IN03 idles high and goes low when the terminal is pulled to ground.

R36 / R31 jumpers

The v3.4 jumpers are still present on versions 3.5 and higher. They set the function of the IN00 terminal on the Microfit connector.

Jumper fitted	IN00 terminal function
R36	IN00/XP02 enabled (standard); 3V3 EXT output disabled
R31	3V3 EXT output enabled; IN00/XP02 disabled

Only one of the two may be fitted.