Bosch CK-M12 Instruction manual

CAN Keypad CK‑M12
Quick Start Manual
Version 1.1 10/29/2018

CAN Keypad CK-M12 Table of contents | en 3
Bosch Motorsport Quick Start Manual 29.10.2019 | Version 1.1 |
Table of contents
1Introduction 4
2Getting started 5
3Wiring 6
4CK-M12 Sport Mounting and Environmental Considerations 8
5Voltage Supply and Current Consumption 9
6CAN Communications 10
6.1 Primary Data Message (CK-M12_TX.dbc) 10
6.2 Feedback Message (CK-M12_RX.dbc) 11
7Example Usage - PBX 16
8Example Usage - DDU 18
9Open Source Software (OSS) Declaration 21
10 Contacts 23

4en | Introduction CAN Keypad CK-M12
29.10.2019 | Version 1.1 | Quick Start Manual Bosch Motorsport
1 Introduction
The CAN Keypad CK-M12 allows for simplification of the dashboard by offering 12 buttons and
9 additional wired inputs to be evaluated and transmitted via CAN bus to other devices on the
bus. Each button has an individually addressable LED indicating ring that can be used to
acknowledge a button press event, indicate status of a device, or alert the driver to a fault
condition.
No special configuration software is needed, all feedback logic is done by PBX, DDU or ECU.

CAN Keypad CK-M12 Getting started | en 5
Bosch Motorsport Quick Start Manual 29.10.2019 | Version 1.1 |
2 Getting started
The following supplies are required to use the CK-M12:
– CK-M12
– Engine controller, data logger or related CAN enabled device
– Appropriate harnessing to connect all devices, note that the CK-M12 does not contain a
termination resistor.
These steps are recommended to get started with the CK-M12:
– Verify the resistance across CANH and CANL is equal to 60 ohms with a multimeter when
the system is powered off. If 60 ohms is not found, check the CAN termination and refer
to the wiring diagram in section three.
– Configure the CAN enabled device of choice to read the CAN messages from the CK-M12.
– Provide power to the CK-M12 and verify CAN communications between the CK-M12 and
CAN enabled device.
– Transmit indicator CAN messages for color and brightness to the CK-M12 and verify
response.

6en | Wiring CAN Keypad CK-M12
29.10.2019 | Version 1.1 | Quick Start Manual Bosch Motorsport
3 Wiring
The following table lists descriptions for each wire of the CK-M12.
CK-M12 Wire Identification
Wire Function
Red 12/24V Power
Black Ground
Yellow CAN high (CANH)
Green CAN low (CANL)
White, Black Band Digital Input 1 Active Low
White, Brown Band Digital Input 2 Active Low
White, Red Band Digital Input 3 Active Low
White, Orange Band Digital Input 4 Active Low
White, Yellow Band Digital Input 5 Active Low
White, Green Band Digital Input 6 Active Low
White, Blue Band Digital Input 7 Active Low
White, Purple Band Digital Input 8 Active Low
White, Grey Band Digital Input 9 Active Low
Figure3.1: CK-M12 Wiring Concept
Notice!
Digital Inputs 1 to 9 are not intended to accept voltage! Additionally a maximum resistance
to ground of 100 Ohm must be respected for proper function of digital inputs.

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The CK-M12 Sport does not include CAN termination on board. Proper CAN termination must
be included in the wiring harness at each end of the bus. A daisy chain style bus must be
constructed with stub lengths for added devices kept to under 1 foot (0.3 meters). Figure 3
shows a correctly constructed CAN bus with termination. Shielding is not required and the CK-
M12 does not offer a shield wire. However, if another module on the CAN bus offers a shield
pin, it is recommended to use it.
Figure3.2: Example CAN bus with proper termination and shield concept

8en | CK-M12 Sport Mounting and Environmental Considerations CAN Keypad CK-M12
29.10.2019 | Version 1.1 | Quick Start Manual Bosch Motorsport
4 CK-M12 Sport Mounting and Environmental
Considerations
The following specifications should be considered for CK-M12 vehicle mounting.
Min. Temperature -40°C
Max. Temperature +85°C
Max. Vibration Bosch Motorsport Vibration Profile 1
Sealing Tightness IP68

CAN Keypad CK-M12 Voltage Supply and Current Consumption | en 9
Bosch Motorsport Quick Start Manual 29.10.2019 | Version 1.1 |
5 Voltage Supply and Current Consumption
The following specifications should be considered for wire and circuit selection.
Supply Voltage 9 V to 32 V
Nominal Voltage 12 V/24 V
Max Current draw 250 mA
Average Current draw 100 mA

10 en | CAN Communications CAN Keypad CK-M12
29.10.2019 | Version 1.1 | Quick Start Manual Bosch Motorsport
6 CAN Communications
The CK-M12 transmits 1 CAN message that provides the status of each button and digital
input, and receives 1 message to configure the indicating ring color for each button and the
overall keypad brightness. The default baud rate is 1,000 kbps, however, other baud rates and
IDs can be achieved through custom configuration by Bosch Motorsport.
Notice!
The brightness value MUST be sent to see any indicator feedback. Colors 9 to 15 will not
be visible when using brightness value 1.
Figure6.1: DBC Data flow
6.1 Primary Data Message (CK-M12_TX.dbc)
ID 0x800 (default setting however IDs can be
reconfigured)
ID type Extended (29 bit identifier)
Direction Transmit from CK-M12
Length 4 bytes
Rate 10 ms
Endian-ness Little (Intel)
Button Status (0 not pressed, 1 pressed)
Bit 0 Button_01
Bit 1 Button_02
Bit 2 Button_03
Bit 3 Button_04
Bit 4 Button_05
Bit 5 Button_06
Bit 6 Button_07