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Iridium Satellite LLC
9601 SBD Transceiver Product Developers Guide
V1.24 120505
Figure 13 shows an oscilloscope plot of five transmit and receive frames:
Figure 13 Current Profile for Five Frames for the 9601
Both traces are 0 referenced on the first graticule line from the bottom of the plot. The upper trace is the
5V supply rail measured at the tick box. The power supply was set for 5.5V and configured for remote
sensing, which gives rise to the voltage overshoot at the end of the transmit burst.
3.3 Serial Data Interface
The Serial data interface is used to both command the 9601 and transfer user data to and from the
Transceiver. The 9601 presents a 9-wire data port to the FA (Field Application), where the interface is at
RS232 levels.
With respect to this interface, the 9601 behaves as a DCE (Data Communication
Equipment), and the FA behaves as a DTE (Data Terminal Equipment).
T h e t e r ms " F A " a n d " D T E " a r e u s e d i n t e r c h a n g e a b l y t h r o u g h o u t t h i s d o c ument; similarly for the terms
" 9601" a n d " D C E " .
Autobaud is not supported in 9601 SBD Transceiver. The baud rate can be set via the AT+IPR command.
The default rate is 19200 bps.
Iridium Satellite LLC Proprietary & Confidential Information
Information contained herein is subject to change without further notice
The scales for the above plot are:
Time base
Current (Yellow trace)
0.5A / cm
Voltage (Red trace)
50mS / cm
1V / cm
21
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