NI myRIO-1950 User Guide and Specifications | © National Instruments | 9
UART Lines
The NI myRIO-1950 has one UART receive input line and one UART transmit ouput line on
each MXP connector. The UART lines are electrically identical to DIO lines 0 to 13 on the MXP
connectors. Like those lines, UART.RX and UART.TX have 40 kΩ pullup resistors to 3.3 V.
Use LabVIEW Real-Time to read and write over the UART lines.
Using the Reset Button
Pressing and releasing the Reset button restarts the processor and the FPGA.
Pressing and holding the Reset button for 5 seconds, then releasing it, restarts the processor and
the FPGA and forces the NI myRIO-1950 into safe mode. In safe mode, the NI myRIO-1950
launches only the services necessary for updating configuration and installing software.
When the NI myRIO-1950 is in safe mode, you can communicate with it by using the UART
lines on MXP connector A. You need the following items to communicate with the myRIO
device over UART:
• USB-to-TTL serial UART converter cable (for example, part number
TTL-232RG-VSW3V3-WE from FTD Chip)
• Serial-port terminal program configured with the following settings:
• 115,200 bits per second
• Eight data bits
• No parity
• One stop bit
• No flow control
Using Button0
Button0 produces a logic TRUE when depressed and a logic FALSE when not depressed.
Button0 is not debounced.
Understanding LED Indications
Power LED
The Power LED is lit while the NI myRIO-1950 is powered on. This LED indicates that the
power supply connected to the device is adequate.
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