Timewave PK-900, Operating Manual

Page: 209 / 392

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CHeck "n/n" Default: 30/30 (300 sec.)
Mode: Packet Host: CK
_________________________________ Parameters: __________________________________
"n" - 0 to 250 specifies the check time in ten-second intervals.
0 - Zero disables this feature.
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CHECK sets a time-out value for a packet connection on each Radio Port if the
distant station has not been heard from for CHECK times 10 seconds.
Without the CHECK feature, if your PK-900 were connected to another station
and the other station disappeared, your PK-900 would remain connected
indefinitely, perhaps refusing connections from other stations.
Your PK-900 tries to prevent this sort of "lockup" from occurring depending on
the settings of AX25L2V2 and RECONNECT, by using the CHECK timer as follows:
o If a Version 1 link is inactive for (CHECK times 10 seconds), your PK-900
tries to save the link by starting a reconnect sequence. The PK-900
enters the "connect in progress" state and sends "connect request" frames.
o If a Version 2 link (AX25L2V2 ON) is inactive and packets have not been
heard from the distant end for "n" times 10 seconds, your PK-900 sends a
"check packet" to test if the link still exists to the other station. If
your PK-900 does not get an answer to the "check packet" after RETRY+1
attempts, it will attempt to reconnect to the distant station.
See the RELINK command for related information.
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CHSwitch "n" Default: $00
Mode: All Host: CH
_________________________________ Parameters: __________________________________
"n" - 0 to $FF (0 to 255 decimal) specifies an ASCII character code.
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CHSWITCH selects the character used by both the PK-900 and the user to show
that a new Radio Port or packet logical channel is being addressed. Chapter 4
of this manual contains a detailed description of this procedure.
DO NOT USE $30 to $39 (0 to 9).
If you plan to use both Radio Ports multiple packet connections, you MUST select
a CHannel SWITCHing character. This character will be interpreted by the
PK-900 to indicate that you want to select another Radio Port or "logical"
packet channel. The vertical bar "|" ($7C) is not used often in conversations
and makes a good switching character. To make the Channel Switching character
the vertical bar, simply enter the command CHSWITCH $7C.
To change the logical packet channel you are using with the PK-900, then
simply type the vertical bar "|" followed by a number 0 through 9 or a letter A
through Z. The numbers 0-9 select a logical channel on Radio Port 1. The
letters A-Z indicate a channel on Radio Port 2.
See CHDOUBLE and CHCALL for further information on the use of CHSWITCH.
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