Manual Documentation Number: MDRxxxxA-807
15
Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018
www.blackbox.com -- Tech Support and Ordering: 724-746-5500 - Fax: 724-746-0746
Refer to the AT Commands section to view the default AT Command Mode
Sequence.
BD (Interface Data Rate)
Command
<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 RF
module. The new baud rate does
not take effect until the CN
command is issued. The RF data
rate is unaffected by the BD
parameter.
Most applications will require one
of the seven standard baud rates;
however, non-standard baud
rates are also supported.
Note: If the interface 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, Flow Control
and CS (DO2 Configuration)
sections.
Non-standard Interface Data Rates:
When parameter values outside the range of
standard interface data rates are sent, the closest 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 BLACK BOX’s Zlinx
Software, non-standard interface data rates can only be set and read using the Zlinx
‘Terminal’ 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
in the BD register.
Parameter Sent vs. Parameter Stored BD Parameter Sent (HEX) Interface Data
Rate (bps)
BD Parameter
Sent (HEX)
Interface Data Rate (bps)
BD Parameter
Stored (HEX)
0
1200
0
4
19,200
4
7
115,200
7
12C
300
12B
1C200
115,200
1B207
AT Command: ATBD
Binary Command: 0x15 (21 decimal)
Parameter Range (Standard baud rates): 0 – 6
(Non-standard baud rates): 0x7D – 0xFFFF
Parameter
Configuration (bps)
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.
Related Commands: CN (Exit Command Mode)
Minimum firmware version required: 4.2B
(Custom baud rates not previously supported.)
16
Manual Documentation Number: MDRxxxxA-807
Black Box Corporation - 1000 Park Drive - Lawrence, PA 15055-1018
www.blackbox.com -- Tech Support and Ordering: 724-746-5500 - Fax: 724-746-0746
BK (Serial Break Passing)
Command
<Serial Interfacing> Pass a serial
break condition on the DI pin to
the DO pin of another module.
BO (Serial Break Timeout)
Command
<Serial Interfacing> DO pin will
return to default after no serial
break status information is
received during the timeout
period.
Use with BK parameter = 1.
BT (Guard Time Before)
Command
<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.
AT Command: ATBK
Binary Command: 0x2E (46 decimal)
Parameter Range:
0 – 1
Parameter Configuration
0 disable
1 enable
Default Parameter Value: 0
Number of bytes returned: 1
Related Commands: BO (Serial Break Timeout)
Minimum Firmware Version Required: 4.30
AT Command: ATBO
Binary Command: 0x30 (48 decimal)
Parameter Range:
0 – 0xFFFF
[x 1 second]
Default Parameter Value: 0
Number of bytes returned: 2
Related Commands: BK (Serial Break Passing)
Minimum Firmware Version Required: 4.30
AT Command: ATBT
Binary Command: 0x04 (4 decimal)
Parameter Range:
0 – 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)
