Modifying Serial Communication Parameters - 3Com WX3008 AC POE 8GET Installation Manual

method. After the negotiation, the sending program starts to send data packets. When receiving a
complete packet, the receiving program checks the packet using the agreed method.
If the check succeeds, the receiving program sends an acknowledgement (ACK) character and the
sending program proceeds to send another packet.
If the check fails, the receiving program sends a negative acknowledgement (NAK) character and
the sending program retransmits the packet.

Modifying Serial Communication Parameters

Sometimes, we need a high serial port baud rate to save the update time, or a lower baud rate to ensure
the transmission reliability. This section introduces how to adjust the serial communication baud rate.
Enter the BootWare main menu, select 2 to enter the serial submenu, and then select 5 to modify the
baud rate. The system displays the following:
=================================<BAUDRATE SET>============================
|Note:'*'indicates the current baudrate
| Change The HyperTerminal's Baudrate Accordingly
|---------------------------<Baudrate Available>---------------------------|
|<1> 9600(Default)*
|<2> 19200
|<3> 38400
|<4> 57600
|<5> 115200
|<0> Exit
===========================================================================
Enter your choice(0-5):
Select an appropriate downloading rate. If you want to a 115200 bps download rate, for example, enter
5. Then the system displays the following information:
Baudrate has been changed to 115200 bps.
Please change the terminal's baudrate to 115200 bps, press ENTER when ready.
Now that the serial communication baud rate of the device has been changed to 115,200 bps while that
of the terminal is still 9,600 bps, the two sides cannot communicate with each other. Change the baud
rate to 115,200 bps in HyperTerminal.
Disconnect the terminal connection in HyperTerminal, as shown below:
5-8
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