6-10
z
If the check succeeds, the receiving program sends an acknowledgement character and the
sending program proceeds to send another packet.
z
If the check fails, the receiving program sends a negative acknowledgement character and the
sending program retransmits the packet.
Modifying Serial Interface Parameters
In actual applications, you need to make the serial interface baud rate higher to save upgrading time or
make it lower to guarantee transmission reliability. This section introduces how to adjust the serial
interface baud rate.
Enter the BootWare main menu and select
2
to enter the serial interface submenu, and then select
5
on
the submenu to modify the baud rate. The system displays the following:
=====================<Baudrate Avaliable>====================
|Note:'*'indicates the current baudrate |
| Change The HyperTerminal's Baudrate Accordingly |
|--------------------<Baudrate Avaliable>-------------------|
| <1> 9600(Default) * |
| <2> 19200 |
| <3> 38400 |
| <4> 57600 |
| <5> 115200 |
| <0> Exit |
=============================================================
Enter Your Choice(0-5):
Select a proper baud rate. For example, select
5
for a baud rate of 115200 bps and 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.
At this time, the baud rate of the serial interface of the device is modified to 115200 bps, while that of the
terminal is still 9600 bps. The device and the terminal cannot communicate with each other. Therefore,
you need to make the baud rate on the terminal consistent with that on the device.
Perform the following operations on the terminal:
Figure 6-2
Disconnect the terminal
Select
File
>
Properties
, and then click
Configure…
to change the bits per second to 115200.
Содержание SECPATH U200-CS
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