Rev 1 Requirement Specification

Requirement Specification

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

• 2 x UART at TTL-levels
• 1 x RS232
• 2 x CAN
• 2 x GPIO

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:

• Spark Core socket, optional part