Specifications

12 PCI-1757UP User's Manual
8255 chip. Each of the 8255 chips has 24 programmable I/O pins that
are divided into two 8-bit ports and two 4-bit ports, designated PA, PB
PCL and PCH. Each port can be programmed as an input or an output
port. User can set the corresponding ports to be configurable as input or
output ports by switch SW2 or software. When “IO CF.” position is
“ON”, user can set the ports to be input or output ports by the software.
Else, when “IO CF.” position is “Off”, user can set the ports by the
switch SW2 directly. The position setting is “ON”, the corresponding
port is input port; else position is “OFF”, the corresponding port is
output port.
Hot reset setting (JP1)
To see the table below, User can use the JP1 to set the hot reset type of
PCI-1757UP.
PCI-1757UP
JP1
Power on configuration after hot reset
Keep the I/O configuration while hot reset.
Clear the I/O configuration to default while
hot reset.
Default setting is lower (1, 2) position.
Table 2-3: Hot reset mode setting