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Chapter 5 Packet Operation
OFF Received CHSWITCH characters appear once (not doubled).
ON
Received
CHSWITCH
characters appear twice (doubled).
Set
CHDOUBLE ON when operating with multiple connections to tell the difference between CHSWITCH
characters received from other stations and
CHSWITCH
characters generated by your DSP. In the following
example CHDOUBLE is ON and CHSWITCH is set to “|” ($7C):
|| this is a test.
The sending station actually transmitted:
| this is a test.
The same packet received with
CHDOUBLE OFF
would be displayed as:
| this is a test.
CHeck
n Default: 30 (300 sec.)
Mode: packet Host: CK
“ n ” 0 to 250 specifies the CHECK time in ten-second intervals.
0 Zero disables this feature.
CHECK sets a time-out value for a packet connection if the distant station hasn’t been heard from for CHECK x 10
seconds.
Without the
CHECK
feature, if your DSP were connected to another station and the other station disappeared, your
DSP would remain connected indefinitely, perhaps refusing connections from other stations. Your DSP tries to
prevent this sort of lock-up from occurring—depending on the settings of
AX25L2V2
and
RECONNECT
—by
using the CHECK timer as follows:
♦
If a Version 1 link is inactive for
CHECK
x 10 seconds, your DSP tries to save the link by starting a
reconnect sequence. The DSP enters the “connect in progress” state and sends “connect request” frames.
♦
If a Version 2 link ( AX25L2V2 ON ) is inactive and packets haven’t been heard from the other station for
“ n ” x 10 seconds, your DSP sends a “check packet” to test if the link still exists. If your DSP doesn’t get an
answer to the “check packet” after RETRY +1 attempts, it will attempt to reconnect to the other station.
See the
RELINK command.
CHSwitch
n Default:$00
Mode: packet Host: CH
“ n ” 0 to $FF (0 to 255 decimal) specifies an ASCII character code.
CHSWITCH (CHannel SWITCHing) selects the character used by both you and the DSP to show that a new
connection channel is being addressed. DO NOT USE $30 to $39 ( 0 to 9 ) .
If you plan to engage in multiple packet connections, you
must select a
CHSWITCH
character. This character will
be interpreted by the DSP to indicate that you want to select another packet channel.
The vertical bar “|” ($7C) is a seldom used punctuation mark and makes a good switching character. To make the
CHSWITCH character the vertical bar, simply enter the command and the vertical bar’s ASCII code: CHSWITCH
$7C
.
To change packet channels, simply type the vertical bar “|” followed by a number between 0 through 9, indicating
which channel you want to use. So, to go from Channel 0 to Channel 1, you’d enter:
cmd:
|1
5-28 September, 05