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

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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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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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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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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

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7. Troubleshooting / FAQ
Situation 1: Not getting any data in my CAN dash/logger
a. Use a multimeter to check that the sensor is getting 12V on its power supply pins.
b. Double check wiring and make sure your CAN stubs’ length is not more than 150cm.
Ensure the correct 120 Ohm termination resistors are installed. If possible, simplify the
connectivity by wiring the sensor directly to a CAN sniffer.
c. If your CAN logger/dash allows you to, check that CAN receive count is increasing.
d. Double-check the configuration parameters on your CAN dash/logger.
●Baud rate
●CAN Ids
●Formulas and byte order
Situation 2: Can you suggest an USB-CAN configuration tool?
a. We’re working on our configuration tool with a dedicated interface for our products. Please
keep in touch if you’re interested in purchasing one.
b. CAN BUS Analyzer Tool (Microchip, APGDT002)
c. PCAN-USB (requires DB9 wiring adaptor)

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8. Support
Please make sure to check the downloads section of our support page as it provides the product’s
datasheet and configuration files for the most common CAN dashboards/loggers. Extra help can
be obtained using our built-in ticket support system or directly via phone.
Downloads: https://www.alsense.eu/downloads/
Support Tickets: https://alsense.eu/osticket/ or email [e-mail]
Phone: [phone]

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Appendix A: ALS Brake Wired CAN Protocol
V1.0
Updated 12.01.2020
A. Default CAN Specifications
1. Base Id
●FL - 0x400
●FR - 0x420
●RL - 0x440
●RR - 0x460
2. Baud Rate: 500kbps
B. System Configuration
Name: CFG_REQ_1
Direction: To Device
CAN Id: <Base Id>
Byte
Name
Formula
Description
0
New Base Id MSB
New Base ID for CAN messages. Requires a power
cycle.
I.e. 0x310 would be:
Byte 0 - 0x03
Byte 1 - 0x10
1
New Base Id LSB
2
Emissivity
= Value /
100
I.e. setting to 75 is 0.75
3
Sample Rate
= Value
1 - 64 Hz (Values outside this range are replaced with
the closest valid one)
4
Sensor Data Order
= Value
0 - temperatures are output right to left
1 - temperatures are output left to right
5
Initial Configuration
Duration (seconds)
= Value
Duration for the “Initial Configuration” phase. In
seconds. Minimum value is 10s.
6
CAN Baud Rate
= 0 -
500kpbs
1 - 1Mbps
Any value different than ‘0’ or ‘1’ will make the system
default to 500kbps.
7
Number of Channels
= Value
1/4/8/16 (Invalid values are replaced with ‘4’)
Name: CFG_RSP_1

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Direction: From Device
CAN Id: <Old Base Id> + 0x01
Byte
Name
Formula
Description
0 New Base Id MSB
New Base ID for CAN messages. Requires a power
cycle.
I.e. 0x310 would be:
Byte 0 - 0x03
Byte 1 - 0x10
0xFF & 0xFF for default address
1
New Base Id LSB
2
Emissivity
= Value /
100
I.e., setting to 75 is 0.75
3
Sample Rate
= Value
1 - 64 Hz (Values outside this range get truncated to
the closest valid one)
4
Sensor Data Order
= Value
0 - temperatures are output right to left
1 - temperatures are output left to right
5
Initial Configuration
Duration (seconds)
= Value
Duration for the “Initial Configuration” phase. In
seconds. Minimum value is 10s.
6
CAN Baud Rate
= 0 -
500kpbs
1 - 1Mbps
Any value different than ‘0’ or ‘1’ will make the system
default to 500kbps.
7
Number of Channels
= Value
1/4/8/16 (Invalid values are replaced with ‘16’)
The device echoes back the settings sent in the first message. <Base Id> is still the one previous to
the change. New settings are applied after a power cycle.
C. System Information
SYS_INFO_1 is sent until the “Initial Configuration” period expires.
Name: SYS_INFO_1
Direction: From Device
CAN Id: <Base Id> + 0x08
Time Interval: Every 5s
Byte
Name
Formula
Description
0
FW Major

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1
FW Minor
2
Emissivity
= Value /
100
I.e. setting to 75 is 0.75
3
Sample Rate
= Value
1 - 64 Hz (Values outside this range get truncated to the
closest valid one)
4
Initial Configuration Duration
(seconds)
= Value
Number of seconds to allow at startup for configuration.
5
Sensor Data Order
= Value
0 - temperatures are output right to left
1 - temperatures are output left to right
6
Num Chans
= Value
7
Reserved
D. Data Reporting
After the <Initial Configuration Delay> expires, the following messages will be sent over CAN
(depending on the configured number of channels)
1 x DATA_TEMPS_1 (Temperature Channels 0 - 3)
1 x DATA_TEMPS_2 (Temperature Channels 4 - 7)
1 x DATA_TEMPS_3 (Temperature Channels 8 - 11)
1 x DATA_TEMPS_4 (Temperature Channels 12 - 15)
1 x DATA_SUMMARY (Sensor Information and Ambient Temperature)
Name: DATA_TEMPS_1
Direction: From Device
CAN Id: <Base Id> + 0x10
Time Interval: Depending on <Sample Rate>
Byte
Name
Formula
Description
0
Chan 0
MSB
= (Temp. Value +
200) * 10
The temperature reading is offset by 200* C and then multiplied by
10. This gives a usable reporting range of:
-200 *C -> 6300* C with 0.1 *C per bit.
I.e. 88.9*C => 2889
MSB: 0x0B
LSB: 0x49
1
Chan 0
LSB
2
Chan 1
MSB
3
Chan 1
LSB
4
Chan 2
MSB
5
Chan 2
LSB

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6
Chan 3
MSB
7
Chan 3
LSB
Name: DATA_TEMPS_2
Direction: From Device
CAN Id: <Base Id> + 0x11
Time Interval: Depending on <Sample Rate>
Byte
Name
Formula
Description
0
Chan 4
MSB
= (Value + 200)
* 10
The temperature reading is offset by 200* C and then multiplied by 10.
This gives a usable reporting range of:
-200 *C -> 6300* C with 0.1 *C per bit.
I.e. 88.9*C => 2889
MSB: 0x0B
LSB: 0x49
1
Chan 4
LSB
2
Chan 5
MSB
3
Chan 5
LSB
4
Chan 6
MSB
5
Chan 6
LSB
6
Chan 7
MSB
7
Chan 7
LSB
Name: DATA_TEMPS_3
Direction: From Device
CAN Id: <Base Id> + 0x12
Time Interval: Depending on <Sample Rate>
Byte
Name
Formula
Description
0
Chan 8
MSB
= (Value + 200)
* 10
The temperature reading is offset by 200* C and then multiplied by 10.
This gives a usable reporting range of:
-200 *C -> 6300* C with 0.1 *C per bit.
I.e. 88.9*C => 2889
MSB: 0x0B
LSB: 0x49
1
Chan 8
LSB
2
Chan 9
MSB
3
Chan 9
LSB

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4
Chan 10
MSB
5
Chan 10
LSB
6
Chan 11
MSB
7
Chan 11
LSB
Name: DATA_TEMPS_4
Direction: From Device
CAN Id: <Base Id> + 0x13
Time Interval: Depending on <Sample Rate>
Byte
Name
Formula
Description
0
Chan 12
MSB
= (Value + 200)
* 10
The temperature reading is offset by 200* C and then multiplied by 10.
This gives a usable reporting range of:
-200 *C -> 6300* C with 0.1 *C per bit.
I.e. 88.9*C => 2889
MSB: 0x0B
LSB: 0x49
1
Chan 12
LSB
2
Chan 13
MSB
3
Chan 13
LSB
4
Chan 14
MSB
5
Chan 14
LSB
6
Chan 15
MSB
7
Chan 15
LSB
Name: DATA_SUMMARY
Direction: From Device
CAN Id: <Base Id> + 0x14
Time Interval: Every 10s
Byte
Name
Formula
Description
0
FW Major

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1
FW Minor
2
Emissivity
= Value / 100
I.e. setting to 75 is 0.75
3
Sample Rate
= Value
1 - 64 Hz (Values outside this
range get truncated to the
closest valid one)
4
Reserved
= Value
5
Sensor Data Order
= Value
0 - temperatures are output
right to left
1 - temperatures are output left
to right
6
Num Chans
= Value
7
Ambient Temperature
= Value + 100
Ambient temperature around
the sensor