HUAWEI MU609 HSPA LGA Module
Application Guide
Serial Port Configuration Application Scenarios
Issue 02 (2013-09-18)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
24
3.2 DTR Hang Up Data Services
3.2.1
Reference Process
Command
Description
AT&D0
Establish a dial-up connection through a serial port for data
services. After this command is executed, data can be
transferred properly.
OK
AT&D2
This command is used to configure the action to be
executed when DTR pin is high level or low level. Which is:
After
AT&D2
is executed, when DTR pin is high level, data
will be transmitted normally; when DTR pin is low level, data
transmission will be terminated.
OK
Note:
At present, only
AT&D0
and
AT&D2
are supported.
AT&D1
is not supported.
3.2.2
Troubleshooting
Scenario
Possible Error
Information
Solution
AT&D1
AT&D1
ERROR
At present, only
AT&D0
and
AT&D2
are supported.
AT&D1
is not
supported.
3.3 DCD Pin Control
3.3.1
Reference Process
Command
Description
AT&C0
Set the DCD pin to be always valid regardless of
data services.
OK