B&B Electronics SPP-100 - Manual - Manual (Page 51)

8.2.2 Device Status Register (Base + 1)
The Device Status Register reports the real-time status of the parallel port
control signals.
Valid in EPP mode only and indicates that a 10
usec time out has occurred on the EPP bus.
Writing a '1' to this bit will reset the EPP Time-out
condition.
'1' = An EPP time-out has occurred
'0' = No EPP time-out EPP Time-out 0
Returns 0. - 1
Returns 0. - 2
Level of the NFAULT input signal.
'0' = Error has been detected.
'1' = No error has been detected. nFault 3
Level of the SELECT input signal.
'1' = Printer is on line.
'0' = Printer is not selected. Select 4
Level of the PERROR input signal.
'1' = Paper end.
'0' = Indicates presence of paper. PError 5
Level of the ACK input signal.
'0' = Printer has accepted the previous character
and is ready to accept another character.
'1' = Printer is still processing the last character or
has not received the data. nAck 6
Compliment of the level of the BUSY input signal.
'0' = Printer is busy and cannot accept a new
character.
'1' = Printer is ready to accept the new character. nBusy 7
Description Name Bit
Figure 17. Device Status Register Table
Quatech Inc. 8-3