User's Manual

TOBY-R2 series - Data Sheet
UBX-16005785 - R06 Interfaces
Page 13 of 41
2.5 Serial communication
TOBY-R2 series provides the following serial communication interfaces:
 UART interface: Universal Asynchronous Receiver/Transmitter serial interface available for the communication
with a host application processor (AT commands, data communication, FW update by means of FOAT), for
FW update by means of the u-blox EasyFlash tool and for diagnostic.
 USB interface: Universal Serial Bus 2.0 compliant interface available for the communication with a host
application processor (AT commands, data communication, FW update by means of the FOAT feature), for
FW update by means of the u-blox EasyFlash tool and for diagnostic.
 DDC interface: I
2
C bus compatible interface available for the communication with u-blox GNSS positioning
chips/modules and with external I
2
C devices as an audio codec.
 SDIO interface: Secure Digital Input Output interface available for the communication with compatible
u-blox short range radio communication Wi-Fi modules.
2.5.1 UART interface
TOBY-R2 series modules include a 9-wire unbalanced Universal Asynchronous Receiver/Transmitter serial
interface (UART) for communication with an application host processor (AT commands, data communication, FW
update by means of the FOAT feature), for FW update by means of the u-blox EasyFlash tool and for diagnostic.
UART features are:
 Complete serial port with RS-232 functionality conforming to the ITU-T V.24 Recommendation [14], with
CMOS compatible signal levels (0 V for low data bit or ON state and 1.8 V for high data bit or OFF state)
 Data lines (RXD as output, TXD as input), hardware flow control lines (CTS as output, RTS as input), modem
status and control lines (DTR as input, DSR as output, DCD as output, RI as output) are provided
 Hardware flow control (default value), software flow control, or none flow control are supported
 Power saving indication available on the hardware flow control output (CTS line): the line is driven to the
OFF state when the module is not prepared to accept data by the UART interface
 Power saving control over the RTS input or the DTR input can be enabled via AT+UPSV command (for more
details see u-blox AT Commands Manual [1] and TOBY-R2 series System Integration Manual [2])
 The following baud rates are supported: 9600, 19200, 38400, 57600, 115200 (default baud rate when
autobauding is disabled), 230400, 460800, 921600, 3000000, 3250000, 6000000 and 6500000 b/s
 One-shot autobauding is supported and it is by default enabled: automatic baud rate detection is performed
only once, at module start up. After the detection, the module works at the fixed baud rate (the detected
one) and the baud rate can only be changed via AT command (see u-blox AT Commands Manual [1], +IPR).
 The following frame format are supported: 8N2, 8N1 (default format when automatic frame recognition is
disabled), 8E1, 8O1, 7E1 and 7O1
 One-shot automatic frame recognition is supported and it is by default enabled in conjunction with
automatic baud rate detection (autobauding): the detection is performed only once, at module start up.
After the detection, the module works at the detected frame format and it can only be changed via AT
command (see u-blox AT Commands Manual [1], +ICF).
UART serial interface can be conveniently configured through AT commands: see the u-blox AT Commands
Manual [1] (+IPR, +ICF, +IFC, &K, \Q, +UPSV AT commands) and TOBY-R2 series System Integration Manual [2].