Sierra Wireless AirLink GL7 00 Series, Product Technical Specification And User Manual

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41110590 Rev 6.1 January 28, 2019 38
Product Technical Specification and
User Guide
Troubleshooting the GL7x00
6.2. No Communications with the GL7x00 through
the USB
If the GL7x00 does not answer to AT commands through the USB, refer to the table below for
possible causes and their corresponding solutions.
Table 23. No Communications with the GL7x00 through the USB
If the GL7x00
returns
Then ask Action
Nothing
Is the GL7x00 powered correctly?
Make sure that the GL7x00 is recognized by
the PC and the USB port provides a voltage of
5V.
Is the USB Device Driver correctly
installed? Download the correct USB drivers from the
Source .
Is the USB cable connected at both
sides?
Check the USB connection.
Does the USB cable correctly follow
the pin assignments? Refer to section
2.2.2 Micro USB Connector for more
information on the USB pin
assignments.
Connect the cable by following the pin
assignments as given in Table 13 USB Pin
Description.
Nothing or non-
significant characters
Is the communication program properly
configured on the PC?
Ensure that the settings of the communication
program are compatible with the settings of
the GL7x00.
The GL7x00 factory settings are:
•
Data bits = 8
•
Parity = none
•
Stop bits = 1
•
Baud rate = 115200 bps
•
Flow control = hardware
Is there another program interfering
with the communication program (i.e.
conflict on communication port
access)?
Close the interfering program.
6.3. Receiving an “ERROR” Message
The GL7x00 returns an
"ERROR"
message (in reply to an AT command) in the following cases:
•
The AT command syntax is incorrect. In this case, check the command syntax applicable to
the GL7500 in document [3] AirPrime HL7588 AT Commands Interface Guide; and
commands marked as supported by HL7692 in document [4] AirPrime HL76xx AT Commands
Interface Guide.
•
The AT command syntax is correct, but was transmitted using the wrong parameters:

Enter the
AT+CMEE=1
command to change the error report method to the verbose
method, which includes the error codes.

Re-enter the AT command which previously caused the reception of an
"ERROR"
message to get the Mobile Equipment error code.