SENA Promi-SD 205 - Manual (Page 32)

Promi-SD User Manual – 4. Trouble Shooting 28
Copyright © 2006 Sena Technologies, Inc. All rights reserved.
No Data Transmission
 COM Port Settings
Check whether the Baud rate of Promi-SD is same as that of its host equipment. If you do not know the current Baud
rate of Promi-SD, initialize it to 9600 by pressing Reset Button.
Check whether the Data bit is set to 8. Promi -SD supports only 8 Data bit. If your host equipment uses 7 Data bit and
even or odd parity, it can work as if it uses 8 Data bit and No p arity. This is valid only when both DCE devices are Promi-
SD. In this case, set both Promi-SDs to 8 Data bit and No parity. If one of DCE devices is other Bluetooth device such as
Bluetooth USB dongle, please contact Technical Support.
Check whether the Parity and Stop bit of Promi-SD are same as those of its host equipment. Promi-SD supports No parity,
Even parity and Odd parity, 1 and 2 Stop bit.
Check whether the host equipment of Promi-SD uses Hardware Flow Control. Promi-SD is initially set to Use of Hardware
Flow Control. If your host equipment does not use Hardware Flow Control, set the Hardware Flow Control of Promi -SD to
No use.
Promi -SD does not support RS-232 break signal.
 Pin Assignment
Promi -SD is DCE device. If your host equipment is DTE, plug Promi-SD directly to the host equipment or use straight RS-
232 cable. If your host equipment is DCE, use cross over RS-232 cable (Null modem cable).
Data Loss or Malfunctioning
 Hardware Flow Control
When transmitting large data with No use of Hardware Flow Control, Promi-SD will clear the data buffer unexpectedly.
This possibility goes higher as the RF transmission environment is bad.
 SD Response
The messages of SD response may affect the function of host system. Set ATS10=0 not to send SD response to host
system and try again. Refer Appendix B. for details.
Transmission Delay
 RF Processing Delay
It takes 30msec approximately for a Promi -SD to complete the data transmission to the other side Bluetooth device. This
time delay cannot be reduced and would be bi gger as the RF transmission environment is bad. Do not use Promi-SD If
your applications cannot allow this time delay.
 RF Transmission Environment
If there are lots of Bluetooth device working in a small area and/or the RF communication distance is too long and/or
there are some obstacles affecting RF performance, Promi-SD repeats the transmission packet by packet due to
interferences and/or low RF performance. This leads the transmission time delay.