[RS485-LB] Incorrect Password error with both PuTTY and the RS485 Config Tool

[javier bollecich]

I am trying to configure a new Dragino RS485-LB and I am unable to communicate with it due to a persistent "Incorrect Password" error. I have tried connecting using two different methods, and both have failed.

My Setup:

• Device: Dragino RS485-LB

• Connection: PC via a 3.3V USB-to-TTL serial adapter. Wiring (GND, RX-TX swap) has been double-checked.

Problem Details:

1. Using a Serial Terminal (PuTTY):

• The connection settings are correct (9600, 8-N-1, Local Echo is ON).

• When I type the basic AT command and press Enter, the device immediately responds with Incorrect Password. This is unexpected, as this command should not require authentication.

2. Using the Dragino RS485 Configure Tool:

• I also tried using the official graphical configuration tool.

• The tool connects to the serial port successfully, but when I try to read the settings from the device, the console output shows an "Incorrect Password" error.

I have already tried a full power cycle of the device multiple times. Because the device immediately asks for a password even for the AT command, I cannot check the firmware version or other settings.

Could you please advise? Does this behavior indicate a firmware issue or that the device is locked in a special mode? What would be the next steps to recover or diagnose it?

Thank you for your help.

[Mengting]

Hi, Javier,

Thank you for reaching out and providing detailed information about your issue.

The behavior you described is expected. Access to the AT command interface on the Dragino RS485-LB is protected by a password. The device requires authentication even for basic AT commands—this is not a firmware issue or a special locked mode.

You just need to send the AT PIN first.

The AT PIN is the last 6 characters of the APPSKEY, which can be found on the label of the device’s packaging. After entering the correct PIN, you will be able to execute AT commands and access the device settings.

Example:

Note: After entering the command, you need to add a line break, and you can also set automatic line breaks in the Bluetooth tool or UART connection tool.

Additionally, you can check the firmware version without using AT commands by observing the startup messages when reset the device. The version information will be displayed during boot.

Example:

Let me know if this resolves the problem or if you need further assistance.

Best Regards
Ting
Technical Support Engineer

 

Dragino Technology Co., Limited

Room 202, Block B, BCT Incubation Bases (BaoChengTai),  No.8 CaiYunRoad

LongCheng Street, LongGang District ; Shenzhen 518101,China

Direct: +86 755 86610829 |Fax: +86 755 86647123

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发件人：

bollecich <jboll...@gmail.com>

发送时间：2025年9月1日(周一) 06:26

收件人："Dragino-user"<dragin...@googlegroups.com>

主　题：[RS485-LB] Incorrect Password error with both PuTTY and the RS485 Config Tool

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