Connecting to Huawei SmartAX MT882 by its serial connection

The Huawei SmartAX MT882

This type of router/modem ADSL 2+ is already old, however may be interesting or required access it via its serial connection.

Circuit schematic

To access the modem via a serial connection is necessary to create an "adapter", it's a RS-232 chip that will convert the signals that will come or go to the modem.
The primary circuit consists in the integrated circuit RS-232, for electrolytic capacitor 1μF and cables to connect the components.
The serial connection plug in the modem depends on the modem version (you need to open the modem).

Circuit schematic

Circuit mounted in a box

Modem board

Note: The LEDs are only to indicate the connection status, can be dismissed.
Theses results are valid for a modem Huawei MT882 SmartAX to version V200R002B023 NOVIS, each version contains different features...

Connection properties

Properties:
- 38400 bits per second
- 8 bits of data
- No parity
- 1 stop bit
- Hardware flow control

Communication success

Welcome screen on successful connection

Communication success

Communication failure

When we see strange characters on the screen may be because of wrong settings, verify the value bits per second.

Communication failure

Help command

Help command

External links:
Connecting to Huawei SmartAX MT882 by its serial connection [PT]
Extract firmware from Huawei MT880 and MT882 [PT]