SENA Parani-SD200L - Manual (Page 43)

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Appendix D: Trouble Shooting
D.1. No Data Transmission
D.1.1. COM Port Settings
Check whether the Baud rate of Parani-SD200L matches that of its host equipment.
Check whether the host equipment has a Data bit setting of 8. Parani-SD200L supports only 8 Data bit
settings. If your host equipment uses 7 Data bit and even or odd parity, it may work with a 8 Data bit
and No parity setting. This is valid only when both DCE devices are the Parani-SD200L. In this case,
set both Parani-SDs to 8 Data bit and No parity. If one of DCE devices is another Bluetooth device
such as Bluetooth USB dongle,7 bit data configurations will not work.
Check whether the Parity and Stop bit of Parani-SD200L match those of your host equipment. Parani-
SD200L supports No parity, Even parity and Odd parity, 1 and 2 Stop bit configurations.
Check whether the host equipment of Parani-SD200L uses Hardware Flow Control. Parani-SD200L 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 way of the dipswitch.
Parani-SD200L does not support RS-232 break signal.
D.1.2. Pin Assignment
Parani-SD200L is a DCE device. If your host equipment is DTE, plug Parani-SD200L directly to the
host equipment or use straight RS-232 cable. If your host equipment is DCE, use will need to use a
cross over RS-232 cable (Null modem cable) or a Male to Male DB9 Null Modem adapter.
D.2. Data Loss or Malfunctioning
D.2.1. Hardware Flow Control
When transmitting large amounts of data with No Hardware Flow Control, Parani-SD200L may clear
the data buffer unexpectedly. The possibility becomes greater as the RF transmission environment
becomes worse.
D.2.2. Response Message
AT response messages from the Parani -SD200L may affect the host system unexpectedly. Do not use
Parani-SD200L If your applications cannot allow for this wireless time delay.
D.3. Transmission Delay
D.3.1. RF Processing Delay
It takes 30msec approximately for a Parani-SD200L 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-SD200L 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-SD200L repeats the
transmission packet by packet due to interferences and/or low RF performance. This may lead to
increased data transmission time delays.