GSM/GPRS/GNSS Module Series
MC60 Series Hardware Design
MC60_Series_Hardware_Design Confidential / Released 55 / 114
1)
It is recommended to keep these pins open in Stand-alone solution.
3.9.1. UART Port
3.9.1.1. Features of UART Port
Seven lines on UART interface
Contain data lines TXD and RXD, hardware flow control lines RTS and CTS, as well as other control
lines DTR, DCD and RI.
Used for AT command, GPRS data, etc. Multiplexing function is supported on the UART Port. NMEA
output and PMTK command can be supported in All-in-one solution.
Support the following communication baud rates: 300bps, 600bps, 1200bps, 2400bps, 4800bps,
9600bps, 14400bps, 19200bps, 28800bps, 38400bps, 57600bps, 115200bps.
The default setting is autobauding mode. Support the following baud rates for autobauding function:
4800bps, 9600bps, 19200bps, 38400bps, 57600bps, 115200bps.
Hardware flow control is disabled by default. When hardware flow control is required, RTS and CTS
should be connected to the host. AT command AT+IFC=2,2 is used to enable hardware flow control.
AT command AT+IFC=0,0 is used to disable the hardware flow control. For more details, please refer
to document [1].
After setting a fixed baud rate or autobauding, please send AT string at that rate. The UART port is ready
when it responds OK.
Autobauding allows the module to detect the baud rate by receiving the string AT or at from the host or
PC automatically, which gives module flexibility without considering which baud rate is used by the host
controller. Autobauding is enabled by default. To take advantage of the autobauding mode, special
attention should be paid according to the following requirements:
Synchronization between DTE and DCE:
When DCE (the module) is powered on with autobauding enabled, it is recommended to wait 2 to 3
seconds before sending the first AT character. After receiving the OK response, DTE and DCE are
correctly synchronized.
If the host controller needs URC in the mode of autobauding, it must be synchronized firstly. Otherwise
the URC will be discarded.
Restrictions on autobauding operation:
The UART port has to be operated at 8 data bits, no parity and 1 stop bit (factory setting).
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