Description Of The Switch Positions S2 (Tty, Bios) - Siemens SIMATIC RI 45 PIII Series Manual

Motherboard
2.7.24

Description of the Switch Positions S2 (TTY, BIOS)

Switch Settings
The following switch settings are for your information only. They are set in
the factory and may not be changed.
x means that this switch is irrelevant for the function described.
BIOS Source S2
off
on
TTY Setting S2
on
off
x
Setting the
S2(4)
Frequency
Frontsidebus S2
off
off
2-22
Pin-No.
3
4
S2 (3)
Boot EPROM activated (standard setting)
Boot EPROM not activated (boot module required)
S2 (1) S2 (2)
on Active TTY interface
(standard setting)
x TTY transmit loop, isolated from power source
(passive setting)
off TTY receive loop, isolated from power source
(passive setting)
ISA Bus PCI Bus CPU Bus
Freq. Freq.
8.25MHz 33MHz 66MHz
8.25MHz 33MHz 100MHz
Meaning
+ Data
Ground
Function
Function
Freq
C79000-G7076-C817-01
RI 45 PIII, Manual