Motus Reference Manual
Page 84 of 146
Version 1.1
29/11/2019
14.1
Serial UART to USB Converter
An FTDI FT232R USB to serial UART converter chip is included on board to allow the
Motus OEM to interface directly to a computer through USB. Two status LEDs indicate
the flow of data to and from the USB port.
USB drivers for all operating systems can be downloaded directly from FTDI's website
at
http://www.ftdichip.com/Products/ICs/FT232R.htm
All development boards are shipped with this interface enabled as standard.
14.2
Dual RS232 Transceiver
An Exar Corporation SP3222EU dual channel serial UART to RS232 transceiver is
included on the development board to allow developers to communicate with the
Motus OEM unit via RS232. The SP3222EU allows baud rates of up to 1000000 baud.
Channel 1 of the SP3222EU is for use with the primary serial port on the Motus OEM
unit and Channel 2 of the SP3222EU is for use with GPIO 3 (RS232 TX 2) and GPIO 4
(RS232 RX 2).
Connection to the RS232 level signals is through a 3x2 2.54mm header, see
Illustration 64. This header is on the left of the board and allows developers to attach
wires or headers as needed.
Please note that by default the SP3222EU is disabled. Switch 1 turns it on, please see
section 14.4.
14.3
GPIO Header and Status LEDs
Users have access to 4 multi-purpose GPIO pins from Motus OEM. These are available
Illustration 64: RS232 header with functions labelled