APRS Digipeatersoftware DIGI_NED
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Other Options

-BU[nnnn] Size of the AX25_MAC-Buffer

AX25_MAC temporarily saves frames of AX25 data in 405 byte buffers. These buffers are used store frames that need to be transmitted and to store received frames before they are retrieved by the application. (403 bytes for the Frame data and 2 bytes for buffer administration).

The number of buffers needed may be totally different from one application to the other and also depends on the number of active ports. If AX25_MAC has a small number of buffers only a few frames can be kept in intermediate buffers and additional data to be send or is received will be lost. Too many buffers waste memory.

The default value of 100 buffers is usually adequate. If many channels are in use and the load is high then it makes sense to increase the value. If there is very little RAM available, then also a smaller number of buffers can be used. If only one or two ports are used then a value of 50 buffers also seems to be adequate.

-C[xx] Transmit-/Receive indicator switch

When using this option an indication of the transmit-/receive status will be displayed while in Host mode. The indicator appears at the top right hand corner of the screen ('S' for transmit (Send), 'R' for receive). When more ports are to be used, each port will have a separate indicator, the left indicator will be the indicator for port 0. When using KISS mode or THD7 mode the indicator will display
the status of the connection between PC and TNC. The indication only works in text mode. The additional parameter specifies a color attribute.


AX25_MAC -C< foreground_value>< Background_value>
AX25_MAC -C17

In this example: Foreground is White, Background is Blue.

Numbers of the Color Attributes:
0 Black
1 Blue
2 Green
3 Cyan
4 Red
5 Magenta
6 Brown
7 White
8 Dark-Grey
9 Light-Blue
A Light-Green
B Light-Cyan (only foreground)
C Light-Red
D Light-Magenta
E Yellow
F Light-White (only foreground)

Numbers for monochrome:
07 Normal
70 Inverse

-F File for the setup parameters (default AX25_MAC.INI)

When using this option (and only then!) the specified file (or when no file name is given AX25_MAC.INI) will be read during the startup of AX25_MAC and interpreted by AX25_MAC. This makes it possible to set the channel access parameters to be used for you radio and channel occupation by other users. The file will be looked for in the current directory if no pathname is given.

The file can be created using normal text editor and may contain comments (preceded by '#' or ';') and empty lines. Each command will be interpreted. Tabs will be handled as spaces and will be ignored at the beginning and end of a Line. An example-file is included in the distribution package of AX25_MAC.

-Ixx Software-Interrupt for AX25_MAC-Interface (40-FF)

The communication between AX25_MAC and the application-program uses the specified software-interrupt. Default value is interrupt 0xFD. You only need to change this if the specified interrupt is already in use by another program.

-L interLock

Normally frames for transmission are transmitted as soon as possible. If the '-L' parameter is specified then only one transmitter is active at any time. If a transmission is ongoing the other transmissions will wait until the transmission is finished. This only works for half- duplex ports. Full duplex ports will transmit regardless of this interlock flag. This option can be used when your transmitters are powered by a power supply that is too weak to supply the transmitters during simultaneous transmissions.

-D Test Mode (Debug)

This option is valid for the most recently supplied '-P' option issued before the '-D' option on the command-line. It will activate a test-mode for this port or these ports. Each interrupt for this port will lead to a voltage change on the internal PC speaker which results in a ticks (cracks) or a tone.

The test mode is mainly used for fault-finding when there are transmit or receive problems during modem operation. (see Appendix 1.1.). When using 1200 baud you should hear a 1800 Hz-Tone (baudrate * 1.5). This tone should be clear and without interruptions. An unclear tone is caused by delayed interrupts. If the quality of the tone sounds disturbed or interrupted then the CPU is overloaded. What is and what is not acceptable is hard to define: some background noise is most likely still acceptable.

When using this option with a KISS, THD7, SCC-Card, PAR96/PICPAR or YAM96 modem you can check if interrupts are generated at all. These interrupts can occur constantly or only during transmission and reception.

When the option '-D' is specified in before any '-P' option then you will hear ticks in time with the system clock.

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