Siemens SIMATIC PANEL PC 877 - Manual (Page 246)

Detailed descriptions
17.6 BIOS setup
SIMATIC Panel PC 877
17-54
Operating instructions, Release 07/2006, A5E00877780-01
"I/O device configuration" submenu
Figure 17-11 COM/LPT configuration submenu
The resources used by an interface are released when you disable the interface in question.
The I/O addresses and interrupts are pre-assigned; it is advisable not to change these
default assignments.
Internal printer port LPT1
Mode: Use this setting to set the operating mode of the printer port. Refer to the table below to
ensure that the setting matches the data output device you connected to the printer port.
Configurable mode Properties
Output Only
Standard Parallel Port -
uni-directional (SPP)
• Standard setting for the 8 bit parallel transfer according to IEEE1284
specifications
• Feedback of the output device is only possible via the control cables
Bi–directional Standard
Parallel Port - bi-
directional
as for SPP – uni-directional, however:
•
Feedback of the output device is also possible via the 8 bit data
cables
EPP enhanced parallel
port
• Enhanced parallel port (data transfer rate from 500 Kbps up to 2
Mbps)
• Hardware handshake
• different devices can be addressed