ZP9D-115RM-LR Radio Modem
25
Non-standard Interface Data Rates:
Any value above 0x38 will be interpreted as an actual baud rate. When a value above 0x38
is 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".
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 actually stored in the module’s BD register.
Parameters Sent Versus Parameters Stored
BD Parameter Sent
(HEX)
Interface Data Rate
(bps)
BD Parameter Stored
(HEX)
0
1200
0
4
19200
4
7
115200
7
12C
300
12B
1C200
115200
1B207
BR (RF Data Rate) Command
<RF Interfacing> The BR command
is used to set and read the RF data
rate (rate that RF data is
transmitted over-the-air) of the
module.
BT (Guard Time Before)
Command
<AT Command Mode Options>
The CC command is used to
set/read the ASCII character used
between guard times of the AT
Command Mode
Sequence (BT + CC + AT). This
sequence enters the module into
AT Command Mode so that data
entering the module (from the host)
is recognized as commands instead of payload.
AT Command: ATBR
Binary Command: 0x39 (57 decimal)
Parameter Range: 0 - 1
Parameter
Baud (bps)
Configuration
0
9600
1
115200
Default Parameter Value:1
Number of Bytes Returned: 1
AT Command: ATCC
Binary Command: 0x13 (19 decimal)
Parameter Range: 0x20 - 0x7F
Default Parameter Value: 0x2B (ASCII “+”)
Number of Bytes Returned: 1
Related Commands: AT (Guard Time After), BT
(Guard Time Before)