SOLO Communication Manual - UART and USB
www.solomotorcontrollers.com
September 2021 - Revision V_1.0.1 Copyright © 2021, All right Reversed. SOLO motor controllers.
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UART and USB Access points on SOLO UNO:
One of the ways of commanding and getting feedbacks from SOLO UNO is using the USB or
UART communication protocols, the USB is accessible through a micro USB type-B connector
mounted on SOLO UNO and UART is accessible through the “Communication port ” as well as
the “UART/CAN bus Pinout” as can be seen below in Figure 1, by using any of these two
terminals, you can fully control SOLO in a complete digital fashion with all the commands and
feedbacks sent and received through data packets.
Figure 1- UART and USB access points on SOLO UNO
- UART TX is not +5V tolerant on SOLO UNO, as it’s an output pin with signal leveled at
3.3V which is compatible with all Arduino and Raspberry Pi modules, connection of this
pin to +5V rated signals will damage the device.
- UART RX is +5V tolerant and it can be fed with signals both leveled at 3.3V or +5V.
- As can be seen in the communication port, Pins 17 and 19 are the TX and RX pins of UART
respectively and they have the exact same functionality and ratings as UART_RX and UART_TX
pins in “UART/CAN bus Pinout”
- On SOLO BETA models both of the UART_TX and UART_RX pins are 3.3V leveled and they are
not +5V tolerant, to use them with +5V leveled systems proper circuitry (voltage dividers) must be
utilized.
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