Teletype 43 Teleprinter Basic RO, Service Manual

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ESTABLISHING COMMUNICATIONS WITH DISTANT TERMINALS
I
26
Establishing connection and transferring to the Data mode is basically under the
control of the directly connected communications device (modem) and its associated
telephone over the switched-network or, without a telephone over private lines. In
some arrangements terminals are directly connected to the distant terminal or
computer. Use of these external devices should be specified locally since many
variations are possible, ie, pushbuttons on modem or on phone, exclusion keys, etc.
The procedures as shown below, that normally apply to operation of the controls of
the terminal, should be followed:
O Before transferring a telephone call to the Data mode (call originated or answered)
•Place terminal in a standby condition:
1.
Turn on ac oower.
2.
Clear any alarm condition (paper-out, low paper, or cover open).
3.
Depress TERM READY key (if not lit). Key should light.
0
Transfer to Data mode
• The TERM ON LINE key lights under control of the external device or distant
station:
1.
Data can be sent or received on-line only when the TERM ON LINE
key is lit.
2.
On some arrangements the TERM ON LINE key may always be lit.
OTo disconnect a telephone call in DATA mode.
• Calls may be disconnected as follows:
1. A disconnect code (Dscnt) is received.
2.
The TERM LOCAL key is depressed. (TERM LOCAL key will light.)
3. The receive buffer is overflowed.
4. Other log-off procedures.