Timewave PK-900, Operating Manual

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testing the link if no data has been sent or received.
The RELINK command sets what happens when the CHECK timer expires. If
RELINK is OFF, the PK-900 changes to the Disconnected state. If ON,
the PK-900 attempts to reconnect to the other station.
4.6 Multiple Connection Operation
Since packet radio allows many stations to share the same channel,
many QSOs can be going on at the same time. Because packet has this
channel sharing capability, there is no reason you cannot connect to
more than one station at the same time. Being connected to multiple
stations at once is a powerful feature of your PK-900.
4.6.1 Multiple Connection Description
The PK-900 offers 10 logical packet channels on Radio Port 1 and 26
logical packet channels when using Radio Port 2. Each logical channel
can support a connection with another packet station. So with the
PK-900, you may be connected to a total of 36 other packet stations
simultaneously.
Multiple connect operation is much like a multi-line telephone with
automatic hold. When you are connected to multiple stations you
will automatically receive everything sent TO you. You must select
the proper channel (in effect push the proper line button on the
telephone) to send data to a particular station.
If you are using an AEA PAKRATT program, this is described in the
program manual. If you are using a terminal, the rest of this section
will describe how to set up the PK-900 for multiple connections.
4.6.2 The Channel Switching Character
The logical channels are selected with the CHSWITCH character. You
must choose a CHSWITCH character that you do not normally type such as
the vertical bar "|" (ASCII $7C), or the tilde "~" (ASCII $7E). Once
this has been selected and entered into the PK-900, you may initiate
multiple connections with others on your radio channel.
The ten logical channels on Radio Port 1 are numbered 0-9. The 26
logical channels on Radio Port 2 are labeled A-Z. After the CHSWITCH
character has been selected, you can now initiate connects on any of
the logical channels numbered zero through nine (0-9) on Port 1 or "A"
through "Z" on Port 2.
To change logical channels on Radio Port 1, press the CHSWITCH
character you just defined, and then a number from 0-9. Remember that
the text that you type will only be sent out to the station connected
to the logical channel your PK-900 is currently on.
This same procedure is used to select a logical channel on Radio
Port 2, only instead of pressing a channel "number" from 0-9, a
"letter" from A-Z is pressed. This is in fact the method used to
switch back and forth between Radio Ports 1 and 2. Please see the
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