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DIDS-402-2AM13
a.
Depresses the END key which inserts an ETX code into the delay
line and resets the cursor to the frame reset or first character of
line position
b.
Depresses the XMIT key to initiate transmission to the CPU
When the One-Step Transmit option is employed, the XMIT key need not
be depressed to initiate transmission; thus, the single step of depressing the
END key is all that is required to initiate transmission.
The point on the screen
to which the cursor is returned when the END key is depressed is determined by
still another option.
In addition, the cursor can be moved to specific positions on the screen by
employing other options.
The Frame-Reset at End-of-Transmit option returns
the cursor to the frame reset position on the screen when the last character (ETX)
of a message is transrnitted.
When the option is not ernployed, the cursor moves
to the next character position on the line, rather than returning to the frame reset
position.
The End-of- Transmit -(EOT) option permits jamming an EOT character
(0000100) into buffer register D3 before transmitting the last character of the
message.
The substitution of an EOT character for ETX (0000011) is commonly
used to indicate the end of transmission for the site where several Display
Terminals are connected in a polling configuration.
In this instance, the last
Display Terminal transmitting signifies the end of site transmission by entering
EOT as a message terminator.
4-5.5 Receive Options
In addition to the Broadcast Addre s s option mentioned previously, still
another option is available in the receive mode.
Normally, the cursor is stepped
to the next character position when an ETX code is received from the CPU.
The
Advance Line at End-of-Receive option permits advancing the cursor to the start
of the next line when the ETX character is received.
4-5.6 Cursor Option
The standard DIDS*-400 cursor is represented by a visual character
(~)
which blinks and is alternately displayed in place of the character at the cursor
position.
A second nonblinking cursor in the form of a backward L (
J )
may be
optionally employed.
This cursor characte:r; brackets the character at the cursor
position in the following manner: (a1).
4-6 INTERFACE CHARACTERISTICS
The Display Terrninal is designed to interface with any device that conforms
to Interface Standard MIL-STD-188B.
The interfacing device is normally a
CPU 110 controller unit or an 110 controller-multiplexer.
The interface con-
nections consist of five lines which exit through a connector at the rear or the
side of the unit (see figure 4-2).
These lines couple the following signals between
the connected devices:
4-4
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