Chapter 5: TESS Operations
Lock Messages
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Teklogix 7035, 8255 & 8260 Terminals User Manual
5.6 Lock Messages
When information is transmitted to the host computer, the keyboard locks to
prevent further data entry until the terminal receives a reply. A locked state is
indicated by either “LOCK-B” (base) or “LOCK-H” (host) in the lower left
corner of the display.
When the reply is received by the terminal, the lock message disappears and the
keyboard can be used again.
Insert mode
• In a left justified field, the <DEL> function erases the character on
which the cursor is positioned, unless it is at the right end of the char-
acter string; in this case, it erases the character to the left of the cursor.
When the last character in a field is erased, the field remains empty,
and any further <DEL> functions in the empty field result in a key-
board error beep.
• In a right justified field, the <DEL> function erases the character that
is to the right of the cursor and then shifts the remaining data one
position to the right.
• If the <DEL> key is pressed while the cursor is in the right-most
character position of that field, the cursor does not shift to the left
when that character is erased; it remains in the right-most position
in the field.
• When the last character in a field is erased, the field remains empty –
i.e. any pre-filled data is not displayed. Pressing the <DEL> key in the
empty field sounds a keyboard error beep.
• The <DEL> key can delete data pre-filled by the host application.
• If data is entered into a field and then deleted before the field is com-
pleted, the field remains unmodified when the cursor leaves the field
or when the screen is transmitted.
Fcursor mode
• Refer to “Field Mode” at the beginning of this table. The <DEL> key
operates in exactly the same manner in “Fcursor mode” as it does in
“Field mode”.
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