Digital Voice Systems VC-20-ATC-10B Especificaciones descargar pdf (Pagina 39)

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 33

5.4.4 Command Processor

The FAA20 accepts commands from three COM ports, i.e., COM1 through

COM3. The first two command ports are physical RS-232 serial ports. The

third command port is a virtual command port supported over the NIB data

stream. The virtual command port allows host systems to access terminal

control and status without the need for another physical connection.

Three instances of a command processor are run in round-robin fashion.

Characters are collected on each port until a carriage return is detected, i.e.

a full command line has been entered. Then, the command is interpreted

by the command processor. Only one command can be processed per

service event. This guarantees all ports have command access even if one

port heavily loads the system.

The command processor supports a variety of terminal commands. These

commands are described in the terminal command reference (see Section

8.0). All commands are entered in ASCII format and are converted to

uppercase. All responses are preceded by a greater than symbol. A built-

in help feature can be accessed to list available command. For each

command, a brief description and valid parameters also can be accessed.

The command processor also handles data transfer required for software

download and vocoder test vector transfer. These data transfers are also

conducted in ASCII format. For software download instructions, see

Section 7.3. For vocoder test vector support, see Section 7.4.

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Digital Voice Systems VC-20-ATC-10B Especificaciones Pagina 39