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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

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