XBee‐PRO®900HP/XBee‐PRO®XSCRFModules
©2014DigiInternationalInc. 112
BD (Interface Data Rate) Command
ParameterSentvs.ParameterStored
BT (Guard Time Before) Command
Command Summary Description
AT Command: ATBD
<Serial Interfacing> BD Command allows the user to adjust the
UART interface data rate and thus modify the rate at which
serial data is sent to the module. The new baud rate does not
take effect until the CN (Exit AT Command Mode) Command is
issued. The RF data rate is not affected by the BD Command.
Although most applications will only require one of the seven
standard baud rates, non-standard baud rates are also
supported.
Note: If the serial data rate is set to exceed the fixed RF data
rate of the module, flow control may need to be implemented
as described in the Pin Signals and Flow Control sections of this
manual.
Non-standard Interface Data Rates: When parameter values
outside the range of standard baud rates are sent, the closest
interface data rate represented by the number is stored in the
BD register. For example, a rate of 19200 bps can be set by
sending the following command line “ATBD4B00”. NOTE: When
using X-CTU Software, non-standard interface data rates can
only be set and read using the X-CTU ‘Terminal’ tab. Non-
standard rates are not accessible through the ‘Modem
Configuration’ tab.
When the BD command is sent with a non-standard interface
data rate, the UART will adjust to accommodate the requested
interface rate. In most cases, the clock resolution will cause the
stored BD parameter to vary from the parameter that was sent
(refer to the table below). Reading the BD command (send
“ATBD” command without an associated parameter value) will
return the value that was actually stored to the BD register.
Binary Command: 0x15 (21 decimal)
Parameter Range (Standard baud rates): 0
– 6
(Non-standard baud rates): 0x7D –
0xFFFF (125d – 65535d)
Parameter
Value
BAUD (bps)
Configuration
0 1200
1 2400
2 4800
3 9600
4 19200
5 38400
6 57600
Number of bytes returned: 2
Default Parameter Value: Set to equal
module’s factory-set RF data rate.
BD Parameter Sent (HEX) Interface Data Rate (bps) S3 BD Parameter Stored (HEX) S3B BD Parameter Stored
(HEX)
0 1200 0 0
4 19,200 4 4
6 57600 6 5
12C 300 12B 12B
E100 57600 E883 E10D
Command Summary
Description
AT Command: ATBT
<Command Mode Options> BT
Command is used to set the DI pin
silence time that must precede the
command sequence character (CC
Command) of the AT Command Mode
Sequence. Refer to the AT Commands
section to view the default AT Command
Mode Sequence.
Binary Command: 0x04 (4 decimal)
Parameter Range:2 – 0xFFFF
[x 100 milliseconds]
Default Parameter Value: 0x0A (10
decimal)
Number of bytes returned: 2
Related Commands: AT (Guard Time
After), CC (Command Sequence
Character)
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