SENA Parani-SD1100 - Manual (Page 50)

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Appendix D: Trouble Shooting
D.1. No Data Transmission
D.1.1. COM Port Settings
Check whether the Baudrate of Parani-SD matches that of its host equipment.
Check whether the host equipment has a Data bit setting of 8. Parani-SD 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-SD. 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-SD match those of your host equipment. Parani-SD
supports No parity, Even parity and Odd parity, 1 and 2 Stop bit configurations.
D.1.2. Pin Assignment
Even though the specification in RS422/485 is established by EIA , that in the physical connector and
pit outs is not established y
et. Wire users’ serial device properly according to DB-9 pin outs of SD1100
before use. RS422 consists of TXD+, TXD-, RXD+ and RXD- and SD1100 is wired crossed with serial
device. For example, TXD+(4) of SD1100 is to wire to RXD+ of serial device and TXD-(8) to RXD-.
RS485 consists of two lines such as TRXD+ and TRXD- and SD1100 is wired in same signals with
serial device. For example, TRXD+(7) of SD1000 is to wire to TRXD+ and TRXD-(3) to TRXD-. Refer
to Appendix A: Connections before connecting serial device to SD1100.
D.2. Data Loss or Malfunctioning
D.2.1. Response Message
The messages of Parani-SD response may affect the function of host system. Set ATS10=0 not to send Parani-
SD 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-SD 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-SD 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-SD repeats the
transmission packet by packet due to interferences and/or low RF performance. This may lead to
increased data transmission time delays.