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6.5 Baudot RTTY <strong>Operating</strong> Tips<br />
The <strong>PK</strong>-<strong>232</strong> can automatically determine the speed of the received<br />
signals with the SIGNAL IDENTIFICATION (SIAM) mode. However, you can<br />
manually step through all the available RTTY receiving speeds with the<br />
RBAUD command.<br />
The following "Function Keys" and immediate commands are included for<br />
Baudot RTTY operating convenience.<br />
Immediate Commands from the Command Mode:<br />
"L"<br />
"N"<br />
"R"<br />
"X"<br />
"K"<br />
Forces LETTERS case.<br />
Forces FIGURES case.<br />
Switches system to receive mode, forces LETTERS case.<br />
Switches system to transmit mode and forces immediate<br />
entry into Converse mode.<br />
Load Transmit type ahead buffer.<br />
"Function Key" characters embedded in transmitted text:<br />
6.5.1 Changing Speed<br />
Sends AAB string as a HEREIS message.<br />
Sends "Who Are You" request to distant station.<br />
Sends LETTERS shift character.<br />
Sends FIGURES shift character.<br />
Shuts off transmitter after sending character buffer.<br />
Sends call sign in Morse and shuts off transmitter.<br />
Sends the Time if the DAYTIME clock has been set.<br />
Assume you've been receiving at 45 bauds and wish to increase the baud<br />
rate in steps. From the Command mode, type RB U followed by an<br />
. The <strong>PK</strong>-<strong>232</strong> responds with:<br />
RBaud was 45<br />
RBaud now 50<br />
The RBAUD command sets the Baudot RTTY speed. The most common speed<br />
is 45 bauds on HF, but other speeds including commercial speeds are<br />
supported. See the Command Summary for all the supported speeds.<br />
6.5.2 Entering Your Auto-AnswerBack<br />
Baudot RTTY allows you to request the identity of the station you are<br />
conversing with by sending your <strong>PK</strong>-<strong>232</strong> the character. This<br />
causes the <strong>PK</strong>-<strong>232</strong> to send a FIGS-D request to the other station.<br />
For this reason, you should set your own Auto-AnswerBack (AAB) message<br />
to either "DE YOUR-CALL" or "QRA YOUR-CALL". See the Command summary.<br />
If you then turn your own WRU command, your <strong>PK</strong>-<strong>232</strong> will automatically<br />
respond by sending the AAB message when another station requests your<br />
identity in Baudot and then stops sending.<br />
4/91 6-5<br />
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