User's Manual

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Appendix D: Trouble Shooting
D.1. No Data Transmission
D.1.1. Device Settings
Check whether the Baud rate of IW05 matches that of its host equipment.
Check whether the host equipment of IW05 uses Hardware Flow Control. IW05 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, IW05 may clear the data
buffer unexpectedly. The possibility becomes greater as the RF transmission environment becomes
worse.
D.2.2. Response Message
The messages of IW05 response may affect the function of host system. Set ATS10=0 not to send IW05 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 IW05 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 IW05. 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 IW05 repeats the
transmission packet by packet due to interferences and/or low RF performance. This may lead to
increased data transmission time delays.