EVM-915-DTS-BZS Linx Technologies, EVM-915-DTS-BZS Datasheet - Page 15

• Manufacturer Part Number: EVM-915-DTS-BZS
• Description: RF Development Tools 915 MHz Wireless Module DTS Brazil
• Manufacturer: Linx Technologies
• Type: Wi-Fir

Specifications of EVM-915-DTS-BZS

• Rohs: yes
• Product: Evaluation Modules
• Tool Is For Evaluation Of: Wi.232DTSB-R
• Frequency: 915 MHz
• Operating Supply Voltage: 3 V to 3.6 V
• Interface Type: UART
• Factory Pack Quantity: 1

Figure 22: UART Data Rate
Figure 23: Data Rate Register Settings
Preliminary Draft
UART Data Rate
By default, the UART data rate is set to 2.4kbps at the factory.
This data rate can be changed by setting the regDATARATE register.
Valid settings are shown in Figure 23.
Troubleshooting Hint: Baud Rate Problems
If you lose track of the baud rate setting of the module, it will be
impossible to program the module. You can either try every possible baud
rate to discover the setting, or force a power-on reset with CMD held low to
set the baud rate to its default: 2.4kbps.
* These data rates are not supported by PC serial ports.
Selection of these rates may cause the module to fail to
respond to a PC, requiring a reset to factory defaults.
Data Rate Register Settings
Baud Rate
2400
9600
19200
38400
57600
115200
10400*
31250*
BR2
0
0
0
0
1
1
1
1
BR1
0
0
1
1
0
0
1
1
–
24
–
BR0
0
1
0
1
0
1
0
1
Network Mode
Figure 24: Network Mode
The module supports two networking modes: Normal and Slave. In normal
mode, the module can talk to any other module. In slave mode, the module
can talk to normal-mode modules, but cannot transmit to or receive from
other slaves. Slave mode is selected by writing 0x00 to this register. The
default network mode is 0x01 or 0x80 (Normal Mode).
Transmit Wait Timeout
Figure 25: Transmit Wait Timeout
When a byte is received from the UART, the module will start a timer that
will countdown every millisecond. The timer is restarted when each byte is
received.
If the timer reaches zero before the next byte is received from the UART,
the module begin transmitting the data in the buffer. Normally, this timeout
value should be greater than 0x01 and greater than one byte time at the
current UART data rate. If the timeout value is set to 0x00, the transmit wait
timeout will not operate, and a full buffer will be required for transmission.
When setup this way, the data will be sent only when a full MTU has been
received through the UART. The default setting for this register is 0x10
(~16ms delay).
–
25
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Preliminary Draft