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USER'S GUIDE
4.5.4.2
Mode A (ARQ) Changeover (
When you finish typing your comments or traffic to the other station and wish the dis-
tant station to transmit to you:
o Don't type
o Do type a plus sign immediately followed by a question mark (+?)
+?
is a software changeover command that switches your system from "Information
Sending Station" (ISS) to "Information Receiving Station" (IRS) and switches the dis-
tant system from "Information Receiving Station" receive to "Information Sending Sta-
tion". Your distant partner will see the
NOTE:
o Don't bother with multiple call signs and "over-to-you" routines used in Baudot and
ASCII RTTY operation. Don't bother with "KKK" at the end of your turn – the system
does it all for you when you type +?.
The FCC requires station identification once every ten minutes. It's sufficient to begin
with
QRA (mycall)
over code.
4.5.4.3
Mode A (ARQ) Break-in (
In Mode A (ARQ), when you're the "Information Receiving Station", you can use the
ACHG
command to break or interrupt the distant station's comments.
ware command that forces both systems to reverse the "Information Receiving" and
"Information Sending" status at both ends of the ARQ link. As the "Information Receiv-
ing Station", you normally rely on the distant station to send the
changeover at the end of his comments.
4.5.4.4
End the Mode A (ARQ) Connect, Return to AMTOR Standby
When you've finished you "final finals" to the distant station and both stations are ready
to end the Mode A (ARQ) contact, you can end the contact and terminate the link in
several different ways:
o Type
<CTRL-C>
R
The
your station can be accessed by a distant station's transmission of your SELCAL.
R
can also be used to stop sending a SELCAL while trying to access a distant sta-
tion.
PK232UG Rev. B 9/86
KKK
or anything like that!
When discussing ARQ operation, we use the terms "Information Sending
Station" and "Information Receiving Station" instead of "transmit" and "re-
ceive". In AMTOR ARQ operation both stations are rapidly switching between
transmit and receive. When you send "information", the distant station sends
back "control" signals that tell your PK-232 how your signals are being re-
ceived, how the link is behaving.
or end your transmission with
ACHG
to return to Command Mode. Then type
command breaks the ARQ link and returns your system to AMTOR Standby –
+?
Command)
+?
and begin typing comments or traffic.
QRA (mycall)
Command)
4-12
OPERATING MODES
before the
+?
change-
ACHG
is a soft-
+?
command to do the
R
to break the link.
65
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