SENA Parani-SD1000 - Manual (Page 16)

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3.5. Hardware Flow Control
Parani-SD1000 plugged into its host system transmits data from host to the other side Bluetooth
device. This data is saved temporarily in the internal buffer of Parani-SD1000 and sent repeatedly until
the transmission is completed packet by packet. When the radio transmission condition is not good
enough to send data promptly, it can cause a transmission delay. If the host sends more data when the
buffer is full, buffer overflow will make Parani-SD1000 malfunction consequently. In order to prevent
this buffer overflow, Parani-SD1000 works as follows.
When using hardware flow control, Parani-SD1000 disables RTS so that it stops receiving any further
data from the host when the buffer becomes full. RTS will be re-enabled again to begin receiving data
from the host when the buffer has created more room for more data.
When hardware flow control is not being used, the Parani-SD1000 clears the buffer to secure room for
the next data when the buffer becomes full. This can mean a loss of data may occur. As the
transmission data becomes large, the possibility of data loss becomes greater.
For large data transmissions, the use of hardware flow control is highly recommended.
3.6. Reset to Factory Defaults
To set all the configuration settings to its factory default parameters, press the reset button, depicted in
Fig. 3-1. Press and hold (for at least 1 sec) the reset button with a narrow pointed tool like paper clip.
Reset works only when power is on.
3.7. Dipswitch
With the combination of 4 slot dipswitches, baud rate and hardware flow control can be set.
Figure 3-1 The Parani-SD1000 Dipswitch
Upper 3 dipswitches are used for setting the baud rate, and bottom dipswitch is used for setting
hardware flow control option. If the baud rate needs to a baud rate not shown below, ParaniWIN or
terminal program should be used to set these speeds. To set a baud rate not shown below the
dipswitches should be in the S/W Config setting. When in the S/W Config setting the baud rate will go
back to 9600 as default.
Table 3-4 Baud rate Settings by Dipswitches
Baud rate
2400 4800 9600 19.2K 38.4K 57.6K 115.2K S/W
Config
Pairing Button Dip switch Reset