A24-HASM-450 Digi International/Maxstream, A24-HASM-450 Datasheet - Page 13

• Manufacturer Part Number: A24-HASM-450
• Description: ANT 2.4GHZ DIPOLE HALF-WAVE
• Manufacturer: Digi International/Maxstream
• Series: XPressr

Specifications of A24-HASM-450

• Antenna Type: Whip: 1/2 Wave, Swivel, Tilt (Right Angle)
• Number Of Bands: 1
• Frequency: 2.4GHz
• Vswr: 2
• Gain: 2.1dBi
• Termination: RP-SMA
• Mounting Type: Connector
• Height (max): 4.35" (110.5mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 70000340; Q2724499B

XBee/XBee‐PRO OEM RF Modules ‐ ZigBee ‐ v1.x1x [2007.06.01]
2.2.3. Receive Mode
2.2.4. Command Mode
AT Command Mode
If a valid RF packet is received and its address matches the RF module’s MY (16-bit Source
Address) parameter, the data is transferred to the serial transmit buffer.
To modify or read RF Module parameters, the module must first enter into Command Mode - a
state in which incoming serial characters are interpreted as commands. Refer to the API Mode
section for an alternate means of configuring modules.
To Enter AT Command Mode:
Default AT Command Mode Sequence (for transition to Command Mode):
All of the parameter values in the sequence can be modified to reflect user preferences.
NOTE: Failure to enter AT Command Mode is most commonly due to baud rate mismatch. Ensure the
‘Baud’ setting on the “PC Settings” tab matches the interface data rate of the RF module. By default,
the BD parameter = 3 (9600 bps).
To Send AT Commands:
Figure 2‐05. Syntax for sending AT Commands
To read a parameter value stored in the RF module’s register, omit the parameter field.
The preceding example would change the RF module Destination Address (Low) to “0x1F”. To store
the new value to non-volatile (long term) memory, subsequently send the WR (Write) command.
For modified parameter values to persist in the module’s registry after a reset, changes must be
saved to non-volatile memory using the WR (Write) Command. Otherwise, parameters are
restored to previously saved values after the module is reset.
System Response. When a command is sent to the module, the module will parse and execute
the command. Upon successful execution of a command, the module returns an “OK” message. If
execution of a command results in an error, the module returns an “ERROR” message.
To Exit AT Command Mode:
Send the 3-character command sequence “+++” and observe guard times before and after the
command characters. [Refer to the “Default AT Command Mode Sequence” below.]
Send AT commands and parameters using the syntax shown below.
1.
2.
© 2007 Digi International, Inc.
• No characters sent for one second [GT (Guard Times) parameter = 0x3E8]
• Input three plus characters (“+++”) within one second [CC (Command Sequence Character)
• No characters sent for one second [GT (Guard Times) parameter = 0x3E8]
parameter = 0x2B.]
Timeout) Command, the RF module automatically returns to Idle Mode.
Send the ATCN (Exit Command Mode) command (followed by a carriage return).
If no valid AT Commands are received within the time specified by CT (Command Mode
[OR]
Chapter 2 ‐ RF Module Operation
13