IPC/RSL8xxx-XxxxE: user documentation
DOC/IPC_RSL8-E; V1.9
© Syslogic Datentechnik AG, Switzerland, http://www.syslogic.com
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2.3.
Operating Modes
The RSL8 is based on the standard PC/AT architecture and therefore operates in DOS-
compatible mode (real mode) on start up. The configurable BIOS initializes all onboard
peripherals to their default values, executes the BIOS extensions programmed into the onboard
BIOS-Flash and BIOS extensions found on installed expansion boards prior to booting the
operating system from a user-selectable drive (boot sector). The operating system (or
eventually a BIOS extension) may switch to protected mode to execute high performance 32-
bit or 64-bit program code.
2.4.
Startup Modes
The RSL8 may startup either in normal operating mode or in BIOS recovery mode:
–
BIOS recovery mode is invoked when rotary switch S1 is set to position ‘8’.
In BIOS recovery mode is intended to reprogram a corrupt main BIOS. Before
starting the reprogram
process, switch S1 must be reset to position ‘0’,
otherwise the recovery BIOS will be overwritten.
–
Normal operating mode is invoked when rotary switch S1 is set to position ‘0’.
Other parameters like backlight control and watchdog base timeout are also dependent on S1
setting:
Switch
S1
Startup Mode
Backlight
Polarity
Backlight
Control
Watchdog
Base Timeout
0
1
2
3
4
5
6
7
normal operating modes
normal
normal
normal
normal
inverted
inverted
inverted
inverted
by BIOS setting
by BIOS setting
by PWM Register 820Dh
by PWM Register 820Dh
by BIOS setting
by BIOS setting
by PWM Register 820Dh
by PWM Register 820Dh
1 s
100ms
1 s
100ms
1 s
100ms
1 s
100ms
8
BIOS recovery mode
normal
by BIOS setting
1 s
9
A
B
factory modes
(do not use)
normal
normal
normal
by BIOS setting
by PWM Register 820Dh
by PWM Register 820Dh
1 s
1 s
1 s
C
D
E
F
factory modes
(do not use)
inverted
inverted
inverted
inverted
by BIOS setting
by BIOS setting
by PWM Register 820Dh
by PWM Register 820Dh
1 s
1 s
1 s
1 s
Tab. 2 Startup Modes