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7.3 Power Line Disturbance (PLD)
When a PLD occurs the fiscal unit goes into a power off state. When power is restored the microcode
checks if command execution was in progress when PLD occurred. If no command was in progress a normal
IPL is performed. If command was in progress then internal Accumulators and Counters are restored to their
original value (the value they had at PLD time). A bit (PLD bit) is included in the IPL status sent over the
communication link.
The PLD bit indicates to the Application that the last command sent was not
executed because of PLD.
The IPL routines restore the accumulators and counters to their original values, but no actions can be
performed on totally or partially printed lines.
To warn the operator that the same line could appear more than once for the same item, an overlay string
(## #) is provided by microcode. This overlay operation is activated when the device driver sets the retry bit
in the repeated command. In response to a retry operation from the application program, the retry bit is set,
allowing the ## # string to overlay the characters on the slip.
The retry bit has effect only on the following commands, but it may be used on all other fiscal commands
with no adverse effect. The string ## # overlays the first 3 characters of the printed line.
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Item Sale
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Negative Item Sale
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Payment
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Not Paid
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Discount/Uplift on Subtotal
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Print Fiscal, Return and Diplomatic Receipt
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End Fiscal, Return and Diplomatic Receipt
•
Print Waybill Receipt
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End Waybill Receipt
The only exceptions to this overlay process occurs during the following commands:
Close Sale Period (13 cmd.) − On IPL completion, after a PLD, the close sale period is completed in
•
one of the following two ways:
Fiscal memory already updated - The close sale period (13 cmd.) is terminated as if the PLD did not
occur.
Fiscal memory not yet updated - The daily data is restored as it was before to issue the 13 cmd. and
the closure report is voided.
Fiscal Memory Report (15 cmd.) − On IPL completion, after a PLD, this function is terminated and
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the fiscal memory report is voided.
Fiscal Software and Hardware Interface Information — Page 181 of 183
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