Rev 1 Requirement Specification - hampussandberg/HexConnect GitHub Wiki

Requirement Specification

The serial monitor should be able to listen to and display these serial interfaces:

General things:

  • All channels should be properly isolated with both power and communication isolation
  • All channels should work independently and it should also be possible to remove channels (not populate them on the PCB) if one does not need CAN for example
  • The device must fit inside a case to protect it from the environment it's used in
  • Connectors should be located on the back of the device with respect to the screen in order to have easy access
  • All channels should be able to disconnect via a relay and must do so when the device powers up

Power:

  • It should be portable in the sense that no bulky power supply should be needed
  • A USB port should be available to power the device from an USB external battery pack
  • A pluggable terminal block for power should be available with input protection and with at least 24 Vin capability
  • It should be possible to adjust the screen brightness if one wants to decrees the power consumption
  • All channels should supply the isolated power and ground in the connector with the power limitations of the isolated DC/DC converter specified

UART:

  • The UART channels should be able to switch between 3.3 V and 5 V (removed)
  • The baud rate should be selectable
  • Choose between different display modes (ASCII, Hex, Decimal, etc.)

RS232:

  • Mostly the same specs. as for the UARTs

CAN:

  • The CAN channels should have selectable bit rate
  • A termination resistor should be able to be switched in if wanted by the user
  • The termination resistor should be located after the disconnect relay so that it can be terminated without the channel being on
  • Filtering of messages
  • Sorting of messages

GPIO:

  • Selectable between input, output and PWM
  • Trigger for the different channels, e.g. start capturing CAN1 data when GPIO0 goes HIGH
  • (Use the GPIO channels to listen to other serial interfaces, e.g. I2C. This will be done in software)

Extra features which are not as important:

  • 2 x ADC channels with auto-ranging capability and 0-50 V input
  • A real-time clock should display the time on the display
  • A user should be able to set the clock via the touch interface
  • An internal temperature sensor should be available to display the temperature on the screen
  • An input for an external thermocouple temperature sensor
  • Sound a signal on the piezo for certain triggers (certain message, when messages are (not) received, etc)
  • Saving output to SD card

Storage:

  • SD-card should be removable by the user in order to save/load data
  • FLASH-memory

Wireless communication: