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Appendix D: Trouble Shooting
D.1. No Data Transmission
D.1.1. Device Settings
Check whether the Baud rate of Parani-ESD matches that of its host equipment.
Check whether the host equipment of Parani-ESD uses Hardware Flow Control. Parani-ESD is initially
set to Use of Hardware Flow Control. If your host equipment does not use Hardware Flow Control,
please disable the Hardware flow control option by ParaniWIN or AT command.
D.2. Data Loss or Malfunctioning
D.2.1. Hardware Flow Control
When transmitting large amounts of data with No Hardware Flow Control, Parani-ESD may clear the
data buffer unexpectedly. The possibility becomes greater as the RF transmission environment becomes
worse.
D.2.2. Response Message
Parani-ESD
Parani-
The messages of
response may affect the function of host system. Set ATS10=0 not to send
ESD
response to host system and try again. Refer Appendix B. for details.
D.3. Transmission Delay
D.3.1. RF Processing Delay
It takes 30msec approximately for a Parani-ESD to complete a data transmission to the other Bluetooth
device. This time delay cannot be reduced and may enlarge as the RF transmission environment
becomes worse. Do not use Parani-ESD If your applications cannot allow for this time delay.
D.3.2. RF Transmission Environment
If there are many Bluetooth devices working in a small area and/or the RF communication distance is
too great and/or there are some obstacles affecting RF performance, the Parani-ESD repeats the
transmission packet by packet due to interferences and/or low RF performance. This may lead to
increased data transmission time delays.
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