9XTend™
OEM
RF
Module
–
Product
Manual
v1.2.4
©
2005
MaxStream,
Inc.
Confidential
&
Proprietary
15
2.2.6.
Command Mode
To set or read module parameters, the module must first enter “Command Mode” (state in which
incoming characters are interpreted as commands). Two command types are available for use:
•
AT Commands
•
Binary Commands
For modified parameter values to persist in the module registry, changes must be saved to non-
volatile memory using WR (Write) Command. Otherwise, parameters are restored to previously
saved values when the module is powered off and then on again.
AT Command Mode
To Enter AT Command Mode:
1. Send the 3-character command sequence “+++” and observe guard times before and after
the command characters. [See “Default AT Command Mode Sequence” below.] The
“Terminal” tab (or other serial communications software) of the X-CTU Software can be used
to enter the sequence.
[OR]
2. Assert (low) the
pin and turn the power going to the module off and back on (or
pulse the
pin).
[If the module is mounted to a MaxStream XTIB-R Interface Board, press the configuration
switch down for 2 seconds.]
Default AT Command Mode Sequence (for transition to AT Command Mode):
•
No characters sent for one second [refer to the BT (Guard Time Before) Command]
•
Input three plus characters (“+++”) within one second
[refer to the CC (Command Sequence Character) Command.]
•
No characters sent for one second [refer to the AT (Guard Time After) Command.]
To Send AT Commands:
Send AT commands and parameters using the syntax shown below:
Figure
2.9.
Syntax
for
sending
AT
Commands
NOTE: To read a parameter value stored in a register, leave the parameter field blank.
The preceding example would change the module Destination Address to “1F”. To store the new
value to non-volatile (long term) memory, subsequently send the Write (ATWR) Command before
powering off the module.
To Exit AT Command Mode:
1. Send ATCN (Exit Command Mode) Command.
[OR]
2. If no valid AT Commands are received within the time specified by CT (Command Mode
Timeout) Command, the Module automatically returns to Idle Mode.
For an example that illustrates programming the module using AT Commands, refer to the
“Module Configuration” chapter [p17].
