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SK51 CAN Keypad

  • Updated

The SK51 is the first in a series of J1939 CAN based keypads that extend the capabilities of our displays and controllers with tactile user input. Each button sends a unique CAN message for button on/off as well as a counter for "button held down" to easily increment and decrement values with large spans in your application.

Each button features a controllable color LED status indicator allowing the developer to create any color scheme and blink sequence desired. The button backlighting color LED's likewise can be controlled through CAN messaging. Brightness of both LED sets is also controllable.

The construction of the keypad allows button customization  by laser etching an icon on the surface of the button. 

 

Demo

Powervision Demo

Windows Demo Utility

  • Windows Keypad Utility Download (extract the files and run the .msi installer)
  • Communicate over CAN with the SK51 using an E-Com cable or WaveShare USB/CAN Adapter
  • Send control messages and monitor button status

Installation 

SK51 Back.png

  • Installation Manual Download
  • Electrical
    • The SK51 comes with a 5" pigtail harness potted into the housing
    • Terminate wires into a connector of choice or splice using a water tight method according to the table below. See specifications for power requirements.       
Wire Color Description
Red Power
Black Ground
Yellow CAN Hi
Green CAN Low
  • Mechanical
    • Mount on a flat smooth surface secured from behind with two M3 screws as shown in the installation manual.
    • The rubber overmold will provide a seal against the mounting surface

CAN Communication 

Monitoring and Control of the SK51 is over a standard J1939 CAN Interface using the messages designated in this section.

  • SK51 Source Address: 0x80 (128), Static
  • Baud Rate: 250K 

Transmitted Messages

Message ID/Data DLC Rate Direction Description
0x14FFFD80 7 bytes 500mSec when  Inactive, 50mSec when button pressed Transmit Button Status
Byte 1       Frame Counter (0-255)
Byte 2       Button 1 Status
Byte 3       Button 2 Status
Byte 4       Button 3 Status
Byte 5       Button 4 Status
Byte 6       Button 5 Status
Byte 7       Not Used

 

 Button Status Definitions

Value Definition
0x00 Not Pressed
0x01 Pressed - active for only one message
0x02 - 0x19 Pressed and held.  Counter begins counting up after held for 250mSec until reaching 25 in about 9.5 seconds. Will continue sending a value of 25 thereafter.

Received Messages

Message ID/Data  DLC Min Rate Direction Description
0x10FF01?? 7 bytes 500mSec Receive LED Color Control
Byte 1.1 (4bits)       Backlight Color - Lower half
Byte 1.5 (4bits)       Backlight Color - Upper half
Byte 2       Brightness - All LED's (0 - 100)
Byte 3       Status 1 LED Color
Byte 4       Status 2 LED Color
Byte 5       Status 3 LED Color
Byte 6       Status 4 LED Color
Byte 7       Status 5 LED Color

 ?? = any source address

LED Color Codes

Value Color
0x00 off
0x01 red
0x02 amber
0x03 green
0x04 blue
0x05 yellow
0x06 purple
0x07 cyan
0x08 white 
0xff previous value

 

Message ID/Data  DLC Min Rate Direction Description
0x10FF03?? 5 bytes 500mSec Receive Status LED Control
Byte 1       Status LED 1 Control
Byte 2       Status LED 2 Control
Byte 3       Status LED 3 Control
Byte 4       Status LED 4 Control
Byte 5       Status LED 5 Control

?? = Any Source Address

Status LED Control Byte Values

Value Function
0x00 LED OFF
0x01 LED On
0x02 LED Flash at 1Hz
0x03 LED Flash at 5Hz
0xFF Previous Value

 

Loss of CAN

If no messages are received after 1 Second the Backlight and Status LED's will turn red and sequence on/off one button at a time to indicate loss of communication. Normal operation is restored immediately once communication is restored.

 

Software Updates

  • At this time there are no software updates required.
  • Updating software is a simple matter of plugging the keypad into your computer via a USB-C cable and copy/pasting the file into the new drive that appears in your windows browser. Do not apply power to the red/black wires during this process, the keypad will be powered from USB.

Button Customization

  • Buttons can be customized with custom icons by laser etching the top layer off revealing the white underlayment.
  • Please contact your distribution partner for details.

Drawing Downloads

Specifications

  • CAN
    • Protocol: SAE J1939
    • Termination Resistor: None
  • Electrical
    • Operating Voltage: 6 to 35 VDC
    • Current Consumption:
      • 200mA (max.) All LED's on
      • 5mA (min) All LED's Off
  • Physical
    • Case Material: High impact PBT/PC, epoxy filled
    • Button Material: Silicon with dual layered paint and top coat
    • Weight: Approximately 100g / 0.2lb
    • Operating Temperature: -40 to +85°C (-40 to +185°F)
    • Environmental Sealing: IP67 Front, IP65 Back

Compliance Certifications 

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