Siemens SIMATIC PC 670 Equipment Manual page 105

Release 04/02
Printer Port Internal LPT1
Mode:
Settable Mode
Output Only
Standard parallel port –
unidirectional (SPP)
Bidirectional
Standard parallel port –
bidirectional
EPP
Enhanced parallel port
ECP
Extended capability port
Panel PC 670 Computing Unit, Equipment Manual
Configuring the Computing Unit in BIOS Setup
Use this setting to set the operating mode of the printer interface. Refer
to the table below to ensure that the setting matches the printer
connected to the printer port.
S
Standard setting for the 8 bit parallel transfer
according to IEEE1284 specifications
S
Feedback of the output device is only possible via
the control cables
as for SPP – unidirectional, however:
S
Feedback of the output device is also possible via
the 8 bit data cables
S
Enhanced parallel port (data transfer rate from
500kbps up to 2Mbps)
S
Hardware handshake
S
different devices can be addressed
as for EPP, however:
S
own DMA channel
S
FIFO backup
S
Data compression
Features
5-17