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erro r. The Parity light can be reset only by operat
ing the Parity Reset switch located to the right of the
light.
Reset Light. The Reset light (Figure 20), is turned
on when any one of the following conditions exist:
Without Buffered Receive and Without Record
Checking Special Features Installed
• Terminal receives parity erro r.
Reset and Parity lights turn on, and printing of
message continues.
The Reset light is turned
off automatically when the (5) EOT code is re
ceived at completion of message.
switch turns Parity light off.
• Terminal receives incorrect-case code.
prints, Reset light turns on and printing of mes
sage continues.
The Reset light is turned off
automatically when (5) EOT code is received at
completion of message.
• Printer overrun. Speed of characters received
faster than printing speed. Reset light turns on
at time of overrun, character(s) lost, however,
printing of message continues. Reset light turned
off automatically when (5) EOT code is received
at completion of message.
• Parity erro r transmitted. Reset and Parity
lights turn on when erro r is detected. Reset key
turns Reset light off.
Parity light off.
• Buffer parity e rro r detected while in enter local
or enter communicate mode. Keyboard locks and
Reset light turns on. Reset key turns light off,
restores the buffer, and terminates enter opera
tion.
• Buffer parity erro r detected during printback
after operating Bid key while in enter local mode.
Reset light turns on, keyboard locks, but printout
is completed. Reset key turns Reset light off,
restores the buffer, and terminates the enter
operation.
With Buffered Receive and Without Record Checking
Special Features Installed
• Parity erro r detected during buffered-receive
printout. Incorrect character prints, Reset
light turns on, and printout continues. Reset key
turns Reset light off.
Hyphen prints,
Parity Reset
Hyphen
Parity Reset switch turns
è Overflow of receive buffer (garbled message
printed). Reset light turns on at time of over
flow and turns off automatically when (5) EOT
code is received at completion of message.
• Parity erro r detected when transmitting. Reset
and Parity lights turn on when erro r is detected.
Reset key turns Reset light off and Parity Reset
switch turns Parity light off.
• Buffer parity erro r detected while in enter local
or enter communicate mode. Keyboard locks
and Reset light turns on. Reset key turns Reset
light off, restores the buffer, and terminates the
enter operation.
• Buffer parity erro r detected during printback
after pressing Bid key when in enter local mode.
Reset light turns on, keyboard locks, but print
out is completed. Reset key turns Reset light off,
restores the buffer, and terminates the enter
operation.
With Record Checking and Without Buffered Receive
Special Features Installed * •
• Terminal receives a parity erro r in text (hyphen
prints in place of erro r character). Reset and
Parity lights turn on when erro r is detected and
printing continues. Reset light turns off auto
matically when terminal receives (5) or (5) code
at end of message.
Parity Reset switch turns
Parity light off.
• Terminal receives a (5) EOT answerback to a (g)
LRC checking sequence. Reset light and audible
alarm turn on and keyboard locks. Reset key
turns Reset light off.
• Detection of buffer parity erro r when terminal is
operating in enter local or enter communicate
mode. Keyboard locks, Reset light turns on, and
the Bid key function, while in communicate mode,
is suspended. Reset key turns Reset light off,
restores the buffer and terminates the enter
operation.
• Detection of parity erro r during a local mode
buffer printout operation. Reset light turns on,
keyboard locks; however, printout is completed.
Operating Reset key turns Reset light off, restores
the buffer, and terminates the enter operation.
IBM 2740 Communication Terminal, Model 2
33
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