BECKHOFF C1230S - Manual (Page 10)

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10 ISA Bus interface card C1230S
C1230S
The C2000BAT UPS Control Board
Uninterruptible power
supply An industry PC with a 24 V power supply can optionally be fitted with an
uninterruptible power supply, which maintains correct operation of the
device for about 15 minutes by means of a NiCad battery after failure of the
main power supply.
Configure the component Control is exercised by the C2000BAT UPS control board. It is accessed
through the parallel input/output chip located in the address range from
230H to 233H. The value 93H must be written into the control register at
address 233H in order to configure the component.
Register Address Function
Port A 230H not used
Port B 231H Read the charge state
Port C
lower half 232H bit 0-3 Various inputs
Port C
upper half 232H bit 4-7 Various outputs
Control
register 233H For this configuration: 10010011B = 93H
Port C
Address 232H
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Output Input
UPS
active/
passive not
used not
used LC
display
illumi-
nation external
supply
voltage Battery
voltage not
used Interro-
gation of
LCD
switch
0=passive
1= active 0= off
1= on 0= failed
1= OK 0=U<16 V
1=U>16 V 0= on
1= off
Controlling the LCD Background
Illumination
Switch for the LCD
background illumination In devices with a uninterruptible power supply built in, the side of the
computer’s housing has a switch for the LC display’s background
illumination.
The background illumination can also be controlled by the software through
bit 4 of port C. Setting the bit switches the illumination on.
If the software clears bit 4, so switching the background illumination off,
you can switch it on again with this switch. The position of the switch can
be interrogated through bit 0 of port C in the input/output component
belonging to the multi-function board at address 232H.