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SMART-MR10/15 User Manual Rev 5 93
B.5 COM Configure COM Port
This command permits you to configure the receiver’s asynchronous serial port communications
drivers.
The current COM port configuration can be reset to its default state at any time by sending it two
hardware break signals of 250 milliseconds each, spaced by fifteen hundred milliseconds
(1.5 seconds) with a pause of at least 250 milliseconds following the second break. This will:
• Stop the logging of data on the current port (see UNLOGALL command in the
OEMV Family Firmware Reference Manual).
• Clear the transmit and receive buffers on the current port.
• Return the current port to its default settings (see Factory Defaults section in
Chapter 2 Commands of the OEMV Family Firmware Reference Manual).
• Set the interface mode to NovAtel for both input and output (see
INTERFACEMODE command in the OEMV Family Firmware Reference Manual).
Abbreviated ASCII Syntax: Message ID: 4
COM [port] bps [parity[databits[stopbits[handshake[echo[break]]]]]]
Factory Default:
com com1 9600 n 8 1 n off on
com com2 9600 n 8 1 n off on
com aux 9600 n 8 1 n off on
ASCII Example:
com com1,57600,n,8,1,n,off,on
Baud rates higher than 115,200 bps are not supported by standard PC hardware. Special
PC hardware may be required for higher rates, including 230400 bps, 460800 bps and
921600 bps. Also, some PC's have trouble with baud rates beyond 57600 bps.
• Do not alter the COM3 port configuration, since COM3 is reserved for Bluetooth
wireless technology.
• On the SMART-MR15, do not alter the COM2 port configuration, since COM2 is
reserved for the cellular modem.
Watch for situations where the COM ports of two receivers are connected together and
the baud rates do not match. Data transmitted through a port operating at a slower baud
rate may be misinterpreted as break signals by the receiving port if it is operating at a
higher baud rate. This is because data transmitted at the lower baud rate is stretched
relative to the higher baud rate. In this case, configure the receiving port to have break
detection disabled using the COM command.