CXECU Command

Configuration of custom parsers to extract specific data from CAN messages.

What is it for?

Use case	Description
🔧 Custom parameters	Extract non-standard data from vehicles with proprietary protocols
🚗 Manufacturer-specific data	Read exclusive PIDs from each vehicle brand
📊 Advanced monitoring	Capture up to 28 CAN parameters simultaneously
⚙️ Value conversion	Apply factor and offset to obtain values in real units
🔄 Total flexibility	Configure endianness, sign and bit range to extract

Description

The CXECU command allows configuring dynamic parsers to extract specific data from CAN messages. This is useful when you need to read non-standard parameters or from vehicles with proprietary protocols.

Support for up to 28 independent configurations (CXECU00-CXECU27), allowing simultaneous monitoring of multiple parameters.

Features

Configurable parsers - Define exactly which bits to extract
28 instances - Up to 28 custom parameters
Factor and offset - Raw value conversion
Endianness - Big Endian and Little Endian support
Signed values - Signed and Unsigned

Commands

Configuration


SCXECU[idx][enable],[can_id],[start_bit],[length],[factor],[offset],[min],[max],[endian],[signed]

Query


QCXECU[idx]

Response


RCXECU[idx][enable],[can_id],[start_bit],[length],[factor],[offset],[min],[max],[endian],[signed]

Parameters

Parameter	Description
`idx`	ECU parser index (00-27)
`enable`	E to enable, D to disable
`can_id`	CAN message ID (hex)
`start_bit`	Data start bit (0-511)
`length`	Number of bits (1-64)
`factor`	Multiplier factor (float)
`offset`	Offset to add (float)
`min/max`	Minimum/maximum valid values (int)
`endian`	BE = Big Endian, LE = Little Endian
`signed`	S = Signed, U = Unsigned

Formula:


final_value = (raw_value * factor) + offset

Examples

RPM Capture:


SCXECU00E,3E8,24,16,0.125,0,0,8000,BE,U  // Parser 00 for RPM, CAN ID 0x3E8

Temperature Capture (offset -40°C):


SCXECU06E,2A0,0,8,1.0,-40,-40,215,BE,S   // Engine temp with -40 offset

Enable and Disable:


SCXECU00E  // Enable parser 00
SCXECU00D  // Disable parser 00

Predefined ECU Indices

Standard Engine Parameters (00-19)

Index	Name	Description
`00`	engine_speed	Engine speed (RPM)
`01`	accel_pct	Throttle percentage (%)
`02`	fuel_pct	Fuel level (%)
`03`	odometer_total	Total odometer (km)
`04`	odoliter_total	Total odoliter (liters)
`05`	speed	Vehicle speed (km/h)
`06`	engine_temp	Engine temperature (C)
`07`	oil_press	Oil pressure (kPa)
`08`	fuel_trip	Trip fuel (liters)
`09`	fuel_trip_soft	Software trip fuel (liters)
`10`	time_engine_on	Total operation hours (hours)
`11`	chassis_code	Chassis code
`12`	fuel_rate	Consumption rate (L/h)
`13`	maf_sensor	Mass air flow sensor (g/s)
`14`	actualPercTorque	Actual torque percentage (%)
`15`	wheel_speed	Wheel speed (km/h)
`16`	status_dtc	Diagnostic trouble code status
`17`	engine_load	Engine load (%)
`18`	engine_runtime	Time since startup (seconds)
`19`	dist_traveled_mil	Distance since MIL (km)

Custom Parameters (20-27)

Index	Name	Description
`20`	custom.fuel_liters	Fuel liters
`21`	custom.fuel_milliliters	Fuel milliliters
`22`	custom.handbrake_status	Handbrake status (0/1)
`23`	custom.brake_pedal_status	Brake pedal status (0/1)
`24`	custom.accelerator_pct	Accelerator percentage
`25`	custom.door_driver	Driver door status (0/1)
`26`	custom.door_passenger	Passenger door status (0/1)
`27`	custom.clutch_pedal_status	Clutch pedal status (0/1)

Compatibility

💾Firmware:v1.00.00

SPLegacy

ULLegacy

SP-IOT

SM-IOT

ZE-IOT