12
3.2. LED Indicators
RS232-Tx and RS232-Rx LED are blinking accordingly when data is transmitted. For small data
transmission, it may be hard to recognize the quick blinking.
Table 3-2 The Parani-SD LED Indicators
Indicator
Power LED
Standby LED
Connect LED
Mode0
Green
┏━━━━━
Red
┏━━━━━
Mode1
Green
┏━━━━━
Green (every 1 sec)
┏┓
Mode2
Green
┏━━━━━
Green (every 3 sec)
┏┰┓
Mode3
Green
┏━━━━━
Green (every 3 sec)
┏┰┓
Connected
Green
┏━━━━━
Green
┏━━━━━━━
3.3. Serial Ports
The applicable settings for serial ports are as follows.
Table 3-3 The Parani-SD Serial Port Settings
Serial Port Settings
Values
Baud rate
1200, 2400, 4800, 9600, 19200, 38200, 57600, 115200, 230400
Data bite
8
Parity
No parity, Even parity, Odd parity
Stop bit
1, 2
Hardware Flow Control
Use, No Use
The values in box are the factory defaults. The flow control setting is configurable only through dip
switch.
3.3.1. Data Bit
Parani-SD supports only 8 data bit. In the case of 7 data bit, please contact the technical support.
3.3.2. Hardware Flow Control
Parani-SD plugged into its host system transmits data from host to the other side Bluetooth device.
These data is saved temporarily in the internal buffer of Parani-SD 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 the transmission delay. If the host sends more data when
the buffer is full, buffer overflow will make Parani-SD malfunction consequently. In order to prevent this
buffer overflow, Parani-SD works as follows.
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.
