Epson Multi-mode Data Controller MFJ-1278B - Manual (Page 281)

MFJ-1278B MULTI-MODE OPERATIONAL COMMANDS
TRACE ON/OFF Mode: Packet Default: OFF
Parameters:
ON
Trace mode is enabled.
OFF
Trace mode is disabled.
This command is used to enable the protocol debugging function. When the TRACE
command is ON, all received frames will be displayed in their entirety, including all header
information. In normal operation you will probably never need this function; however, if you
need to report an apparent software bug, we may ask you to provide trace information if
possible.
A trace display will appear in four columns on an 80-column display. Following is an
example trace display. For comparison, the frame shown in the trace example would be
monitored as follows:
KV7B>CQ,KF7B*:this is a test message
The trace display would look like this:
byte -------------------hex display---------------------shifted ASCII-----------ASCII---------
000: 86A24040 40406096 AC6E8440 4060968C CQ 0KV7B 0KF ..@@@@`..n.@@`..
010: 6E844040 E103F074 68697320 69732061 7B P.x:449.49.0 n.@@...this is a
020: 20746573 74206D65 73736167 650D .:29:.6299032. test message.
The byte column shows the offset into the packet of the beginning byte of the line. The hex
display column shows the next 16 bytes of the packet, exactly as received, in standard hex
format. The shifted ASCII column attempts to decode the high order seven bits of each byte
as an ASCII character code. The ASCII column attempts to decode the low order seven bits
of each byte as an ASCII character code. In a standard AX.25 packet, the callsign address
field will be displayed correctly in the shifted ASCII column. A text message will be
displayed correctly in the ASCII column. Non-printing characters and control characters are
displayed in both ASCII fields as ".". You can examine the hex display field to see the
contents of the sub-station ID byte and the control bytes used by the protocol. Protocol
details are discussed in Chapter 9.
TRace ON/OFF
Mode: Pactor Default: OFF
This command displays continuous debug information to the computer screen. This is the