DFR0781 BT401 How to enter AT mode?
Per.Svensson 2025-04-02 05:11:05 203 Views4 Replies The default mode for BT401 is transparent pass through mode.
In the documentation there is not mentioned how to leave transparent mode and enter AT-mode.
How is this done from the serial UART?
The normal way for modems is to enter +++ and wait for OK.
This does not work for me.
Pleeease give me instructions. I have run out of ideas!! :(
/Per
Thanks for the answer. But there are still some things I cant understand.
1. How can the modem recognise a AT-command in transparent mode?
There is no way to distinguish it from any other text-string on its way to the receiver.
The serial stream could very well contain AT+..…
2. I have tried all sort of AT-commands and none of them are accepted.
They are simply sent transparently to the receiver the
3 The modem listen to a few AT-commands just after Reset. But after a couple of seconds it enters transparent mode. Please explain the start up procedure.
Sorry to say. There is certainly something I have missed!
/Per
Per.Svensson Thanks for the answer. But there are still some things I cant understand.
1. How can the modem recognise a AT-command in transparent mode?
There is no way to distinguish it from any other text-string on its way to the receiver.
The serial stream could very well contain AT+..…
2. I have tried all sort of AT-commands and none of them are accepted.
They are simply sent transparently to the receiver the
3 The modem listen to a few AT-commands just after Reset. But after a couple of seconds it enters transparent mode. Please explain the start up procedure.
Sorry to say. There is certainly something I have missed!
/Per
Per.Svensson BT401 does not need to send a command to enter AT mode, you only need to send the corresponding AT command can be, but pay attention to the '\r\n' after the AT command.
erhahaha Couldyou please elaborate your answer a little bit?
