12
In case of using hardware flow control, Parani-SD makes RTS be ‘disable’ to stop receiving further
data from the host when the buffer becomes full. RTS will be ‘able’ to begin receiving data again from
the host when the buffer has some room for more data.
In case of not using hardware flow control, Parani-SD clears the buffer to secure the room for next
data when the buffer becomes full. This means the loss of data. As the transmission data becomes
large, the possibility of data loss goes higher.
For large data transmission, use of hardware flow control is highly recommended.
3.3.3. Reset to Factory Defaults
To turn back all the configurations to its factory settings, press the reset button depicted in Fig. 1-3.
Press the reset button with a narrow pointed tool like paper clip longer than 1 second. Reset works
only when power is on.
3.3.4. Dipswitch
This feature is only on Parani-SD205. With the combination of 4 slot dipswitches, baud rate and
hardware flow control can be set simply without host computer.
Figure 3-1 The Parani-SD Dipswitch
Upper 3 dipswitches are used for setting baud rate, and bottom dipswitch is used for setting hardware
flow control option. If the baud rate needs to be set out of the range given below, ParaniWIN or
terminal program should be used for extended AT commands. At this time combination of dipswitches
must be complied with AT cmd. Then baud rate will go back to 9600 as default.
Table 3-4 Baud rate Settings by Dipswitches
2400 4800 9600 19.2K 38.4K 57.6K
115.2K
AT
cmd
Baud rate
Table 3-5 Hardware Flow Control Settings by Dipswitches
No Use
Use
Hardware Flow Control
Handshaking
‘
Pairing Button
Dip Switch
Reset Button
