Product Info

Chongqing Jinou Science &Technology Development Co., Ltd .
http://www.oemblue.com/ [e-mail]
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4 How the multipoint connections send and receive data? And
what are the differences between the sending & receiving of
multipoint and point-to -point connections?
The point to point sending and receiving data has no distinction of master device and slave
device. But the multipoint connection has the distinction of master device and slave device.
Each slave device can receive the data from a master device, but when send data from a
slave device, only the master devices can receive it and other slave devices cannot receive
this data. If multiply slave devices send data to the master device at the same time, the data
sending from the serial port of the master device is intertwined and cannot distinguish
which device it was sent from.
5 Can not set the parameters, or use the Configuration Tools
displaying "connection timeout" when connects to the PC
First, make sure if the indicator of the module in the data mode is blinking, and blinking
means that the module works properly;
Make the module enter into the parameter setting mode. At this time, all of the indicators
extinguish except for the power indicator;
Whether the serial port number of the setting tool (the Configuration Tools which JS&T
provides) is the serial port you are using;
If use the serial line to connect with the PC, make sure whether the connection line is
correct. Check the connection instruction of the serial port to learn about the connection
method.
6 How to send AT command by your hand？
For most AT commands are not given in the Configuration Tools, it can only send through
entering commands by hand when necessary. The steps are as follows:
Select a serial communication software (such as HyperTerminal or serial debugging
assistant) to open the linked serial port. The serial port parameters under the parameter
setting state are always configured to 9600bps and 8-N-1, and they have nothing to do with
the serial parameters of the data communication which the AT command set.
Press the toggle key to make the device enter into the parameter setting state. The blinking
indicator extinguishes and the serial port should receive "+ OPEN: x\r\n ", and “x” as the
current number of the memorized devices. Then you can send commands. What need to be
noted is that all commands are end with CRLF ""\r\n ". All the commands will return
"\r\nOK\r\n " to response after sending and receiving correctly. If returns "\r\nERROR\r\n
" , please check whether the sending is correct. For example: sending a test command
AT \r\n should send the 4 bytes ‘A’‘T’‘\r’‘\n’. The Bluetooth returns “\r\nOK\r\n” after
receiving properly.