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PCCOM 8-BIT ISA 2-PORT RS422/485
DECISION COMPUTER INTERNATIONAL CO., LTD.
PCCOM 8-BIT ISA 2-PORT RS422/485
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Card Type
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Serial
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Chipset
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Unidentified
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I/O Options
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Serial ports (2)
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Data Bus
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8-bit ISA
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CONNECTIONS
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Function
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Label
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Serial ports via DB-37 port
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CH1
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Note:Standard DB-25 serial ports are provided on an included adapter cable.
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SERIAL PORT ADDRESSES
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Port 1 Address
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Port 2 Address
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JP7
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3F8h (COM1:)
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2F8h (COM2:)
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Pins 1 & 3, 2 & 4 closed
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3E8h (COM3:)
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2E8h (COM4:)
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Pins 1 & 3 closed
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1A0h
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1A8h
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Pins 2 & 4 closed
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PORT 1 INTERRUPT
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Setting
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JP5/A
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JP5/B
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JP5/C
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JP5/D
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JP5/E
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JP5/F
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IRQ2
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Open
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Open
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Open
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Open
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Open
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Pins 2 & 3
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IRQ3
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Open
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Open
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Open
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Open
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Pins 2 & 3
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Open
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IRQ4
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Open
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Open
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Open
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Pins 2 & 3
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Open
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Open
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IRQ5
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Open
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Open
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Pins 2 & 3
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Open
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Open
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Open
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IRQ6
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Open
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Pins 2 & 3
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Open
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Open
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Open
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Open
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IRQ7
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Pins 2 & 3
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Open
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Open
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Open
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Open
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Open
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Note:Pins designated are in the closed position.
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PORT 2 INTERRUPT
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Setting
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JP5/A
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JP5/B
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JP5/C
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JP5/D
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JP5/E
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JP5/F
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IRQ2
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Open
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Open
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Open
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Open
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Open
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Pins 1 & 2
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IRQ3
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Open
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Open
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Open
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Open
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Pins 1 & 2
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Open
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IRQ4
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Open
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Open
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Open
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Pins 1 & 2
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Open
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Open
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IRQ5
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Open
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Open
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Pins 1 & 2
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Open
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Open
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Open
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IRQ6
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Open
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Pins 1 & 2
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Open
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Open
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Open
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Open
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IRQ7
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Pins 1 & 2
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Open
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Open
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Open
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Open
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Open
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Note:Pins designated are in the closed position.
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PORT 1 TRANSMIT DRIVER
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Setting
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JP1/A
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JP1/B
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JP1/C
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Always on
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Closed
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Open
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Open
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Follows RTS signal
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Open
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Closed
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Open
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Follows bit 0 of control register
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Open
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Open
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Closed
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PORT 2 TRANSMIT DRIVER
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Setting
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JP2/A
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JP2/B
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JP2/C
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Always on
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Closed
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Open
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Open
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Follows RTS signal
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Open
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Closed
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Open
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Follows bit 0 of control register
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Open
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Open
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Closed
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PORT 1 RECEIVE DRIVER
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Setting
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JP3
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Always on
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Pins 1 & 3 closed
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Follows bit 1 of control register
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Pins 2 & 4 closed
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PORT 2 RECEIVE DRIVER
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Setting
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JP4
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Always on
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Pins 1 & 3 closed
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Follows bit 1 of control register
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Pins 2 & 4 closed
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WAIT STATES
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Setting
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JP6/A
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JP6/B
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JP6/C
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JP6/D
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JP6/E
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0
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Closed
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Open
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Open
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Open
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Open
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1
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Open
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Closed
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Open
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Open
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Open
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2
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Open
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Open
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Closed
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Open
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Open
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3
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Open
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Open
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Open
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Closed
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Open
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4
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Open
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Open
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Open
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Open
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Closed
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