ALSENSE ALS Brake Wired User manual

ALS Brake Wired Install Guide
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© Alsense Motorsport SRL
ALS Brake Wired
Install Guide
(9.03.2022)
V1.1 – Changed connector to DTM06-4S
V1.2 - CAN Protocol Update (from firmware 0.130 onwards)
www.alsense.eu

ALS Brake Wired Install Guide
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© Alsense Motorsport SRL
Table of Contents
ALS Brake Wired 1
www.alsense.eu 1
1. Introduction 3
2. Specifications 3
3. Physical Installation 4
4. Electrical Installation 8
5. Configuration 9
6. CAN Temperature Data Decoding 10
7. Troubleshooting / FAQ 11
8. Support 12
A. Default CAN Specifications 13
B. System Configuration 13
C. System Information 14
D. Data Reporting 15

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© Alsense Motorsport SRL
1. Introduction
Thank you for purchasing the ALS Brake Wired. The following guide is aimed at providing an
overview of the typical install process for both a single sensor as well as for a complete set.
2. Specifications
CAPABILITIES
Number of Channels 16/8/4/1 (16 default)
Sample Rate
1-64Hz (20Hz default)
FOV
110°
Accuracy
1°C
Emissivity
0.01 – 1 (0.83 default)
ELECTRICAL
Supply Voltage
5 – 20V
Supply Current 15 mA
PHYSICAL
Dimensions
Weight
Protection Rating
IP66
CONNECTIVITY
Wiring
0.5m unterminated (DTM-4P
optional)
CAN
2.0A (11bit identifier)
Bit Rate
500kbps/1Mbps (500kbps
default)

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3. Physical Installation
Before installing the sensor in its final position, please ensure that:
1. All the necessary configuration parameters have been set (number of channels and order,
emissivity, startup delay time). We can perform these for you if you get in touch with us
before shipping or using the ‘Notes’ field in the checkout process.
2. There are provisions for installing the required 120 Ω CAN bus termination resistors. Please
see section ‘3. Electrical Installation’ for further details
The sensor should be mounted in its final position using the mounting holes situated on the sides
of the housing. For temporary installs we’ve successfully used 3M Dual-Lock tape, but extra care
should be employed when using such a solution.

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© Alsense Motorsport SRL
We do mounting the sensor such that it avoids direct exposure to significant heat sources (i.e.
exhausts).
The IR sensor has a horizontal FOV of 110°. As the sensor is placed further away, the maximum
width of the brake diameter increases. Please consult the table and the graph below or get in
touch if you have any questions. Please consult ‘Figure 1’ in order to determine how to orient the
sensor.

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Maximum Disc Width (mm)
Mounting Distance (mm)
100
35
150
52
225
79
250
88
275
96
300
105
350
123
400
140
Figure 1 - Channel assignment / sensor data order

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Figure 2 - Visual Representation of channel assignments

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© Alsense Motorsport SRL
4. Electrical Installation
Depending on the option you have ordered, the sensor will come with either an unterminated
end or a DTM06-4S connector. The mating connector is DTM04-4P
a. Unterminated
●12V – Orange / White
●GND – Green / White
●CAN Low – Blue / White
●CAN High – White
b. DTM06-4S
●Pin 1 – GND
●Pin 2 – 12V
●Pin 3 – CAN Low
●Pin 4 – CAN High
CAN Connectivity
Every CAN bus network requires two 120 Ohm resistors placed at each end, as the diagram below
(Rterm = 120 Ohms) shows. If you are not familiar with CAN bus, we recommend that you consult
with a professional. Incorrect installation can damage the devices or produce unsatisfactory
performance.

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Always use twisted paired cable for CAN Low and CAN High wiring as it greatly improves the
signal’s tolerance to electrical noise. Also try and keep wiring stubs (cables going from the main
CAN bus lines to individual devices) at a minimum. Our sensors come with a 0.5m cable, it’s
generally ok to have another 0.5m in addition to that.
5. Configuration
If you haven’t requested a custom configuration for the sensors in your order, the default
settings are as follows, along with a short description of what their function is:
Parameter
Default Value
Function
CAN Base ID
0x400 (for a one sensor order)
– Front Left
0x420 – Front Right
0x440 – Rear Left
0x460 – Rear Right
Base CAN ID for all messages
sent from the sensor
Emissivity
0.83
Lowering the emissivity
increases the brake
temperature. Suggested values
depend on the brake disc
material.
Sample Rate
20 Hz
Sampling and reporting rate
for the sensor
Number of Channels
16
Number of channels used for
sampling
Sensor Data Order
Left to Right
[Figure 1]
Channel numbering direction
when looking at the sensor’s
camera
CAN Bit Rate
500 kbps
Initial Configuration Delay
60 seconds
The delay, in seconds, between
the sensor powering up and it
starting to send temperature
data over CAN. This is when
new configuration parameters

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can be sent.
Please consult Appendix A: ALS Brake Wired CAN Protocol for complete information on the CAN
protocol.
Typical Configuration Procedure:
1. Ensure the sensor is powered and with correct CAN connectivity to the device you’re using
to transmit CAN messages from.
2. If you’re using a device with CAN sniffing capabilities, please confirm that, after powering
the sensor, you’re seeing the SYS_INFO_1 CAN (Base CAN ID + 0x08) message come in every
5 seconds during the initial configuration delay.
3. Form the configuration message (CFG_REQ_1) in your CAN transmit tool and, if valid, you’ll
receive back a response (CFG_RSP_1) to confirm the new settings. These get applied after a
power cycle.
6. CAN Temperature Data Decoding
The complete format of temperature data reported by the sensor is described in Appendix A: ALS
Brake Wired CAN Protocol. The formula to calculate each individual channel is as follows:
Temperature_Value = (Byte 0 * 256 + Byte 1) / 10 - 200°C