Digital Voice Systems VC-20-ATC-10B Spezifikationen Seite 15

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FAA20 Embedded NEXCOM Vocoder
Board Manual
This manual has been prepared for the Federal Aviation Administration.
FA100-00107 (March 2004) Rev 1.0.0 Page 9
3.2 Terminal Connectors
The two DB9F serial connectors are used for terminal control. The
connectors labeled UART A and UART B on the silkscreen are the COM1
and COM2 interfaces, respectively. Both/either interface can be used for
terminal control and software download with one exception. If the main
program is erased and the unit is power cycled, the boot application only
uses COM1. The boot application supports main program download.
The default communication setup has the following characteristics:
115,200 bps, 8 data bits, 1 stop bit, no parity, no flow control
While this setup facilitates quick setup with three-pin serial cables, it is
recommended that the user enable hardware flow control. Hardware flow
control prevents character loss when printing large sets of data and is also
required for main software download.
The FAA20 utilizes a data communication equipment (DCE) interface.
Figure 3 provides a pin location diagram. Table 2 contains a list of DB9F
signals.
Figure 3: DB9F Connector Diagram
Table 2: DB9F Signals
SIGNAL PIN DIR DESCRIPTION
CD 1 O Carrier Detect. Always active.
RXD 2 O Receive Data.
TXD 3 I Transmit Data.
DTR 4 I Data Terminal Ready.
GND 5 --- Ground
DSR 6 O Data Send Ready.
RTS 7 I Request to Send.
CTS 8 O Clear to Send.
RI 9 O Ring Indicator. Always active.
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