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4.4 Selection of DIRECT
or INDIRECT mode
The operating mode must be selected before enciphering or deciphering
commences.
In general, the DIRECT mode is used when the input is already on
punched tape and need not be monitored;the desired result — cryptogram
or deciphered text — appears almost simultaneously with the input.
The INDIRECT mode is normally used when the input is to take place
from the keyboard and monitoring of the input is operationally desirable;
the desired result is produced by pressing the OUTPUT button.
The INDIRECT mode is selected by pressing the dual-action INDIRECT
button (11), which latches in the "down" position; the DIRECT mode
is selected by releasing the button.
In the INDIRECT mode, the lamp inside the INDIRECT button signifies
"text in memory" and is controlled by other crypto controls, as described
in the procedures which follow. In the DIRECT mode the lamp is ex
tinguished.
4.5 Enciphering
4.5.1 Crypto procedure
The following crypto procedure must be completed before starting
to encipher.
1. Push OFF-LINE button (2)
2. Push PROC button (7)
Lamp lights inside button
Lamp lights inside button.
AROFLEX prints serial number
and checkword of indicator key
( if present), followed by SELECT
on new line.
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