Smc-networks 486DX4 Uživatelský manuál stáhnout pdf (Strana 17)

AR-B1462 User¡¦s Guide

2-9

(4) Printer Status Buffer

The system microprocessor can read the printer status by reading the address of the Printer Status Buffer. The bit

definitions are described as follows:

X X X

1234567 0

-ERROR

SLCT

-ACK

-BUSY

Figure 2-2 Printer Status Buffer

NOTE: X presents not used.

Bit 7: This signal may become active during data entry, when the printer is off-line during printing, or when the

print head is changing position or in an error state. When Bit 7 is active, the printer is busy and can not

accept data.

Bit 6: This bit represents the current state of the printer’ s ACK signal. A0 means the printer has received the

character and is ready to accept another. Normally, this signal will be active for approximately 5

microseconds before receiving a BUSY message stops.

Bit 5: A1 means the printer has detected the end of the paper.

Bit 4: A1 means the printer is selected.

Bit 3: A0 means the printer has encountered an error condition.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 80 81

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Smc-networks 486DX4 Uživatelský manuál Strana 17