CHAPTER 5
SWITCH SETTING

 
5.1 Introduction

The three switch blocks and three jumpers on the PCCOM 8 port adapter must be configured correctly in accordance with the operating system you are using.

SW1 (Switch 1)
Determines the I/O address of the UARTs.


SW2 (Switch 2)
Selects which interrupt will be used in the range IRQ2 through IRQ7.

SW3 (Switch 3)
Selects the interrupt vector address and determines which port is active when an interrupt occurs.


JP1 (Jumper 1)
Select master or slave board.

JP2 (Jumper 2)
Daisy chain jumper for installing more than one boards which use the common IRQ.

All addresses specified are in hexadecimal. The actual interrupt latch address is set to the interrupt vector address set by switch 3 + 2H.

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5.2 Selection of Switch Settings

It is important to refer to the user manual supplied with your operating system to determine the correct configuration. Although we provide installation advice for various operating systems, it is not possible to cover all systems in this user guide. Please contact your supplier if you have any difficulties with configuration.

IMPORTANT : CARE MUST BE TAKEN IN SELECTING THE CONFIGURATION OF SWITCHS TO ENSURE YOU DO NOT DUPLICATE SETTINGS OF OTHER EQUIPMENT ALREADY INSTALLED IN YOUR COMPUTER. DUPLICATION OF SETTINGS WILL RESULT IN A MALFUNCTION OF ONE OR BOTH DEVICES.

Please refer to the following settings for each switch block. If you are installing more than one board, do not duplicate jumper settings for any parameter. 

DECISION COMPUTER INTERNATIONAL CO .,LTD.

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DECISION INTERNATIONAL CO.,LTD.

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NOTE: The address selected must start on a multiple of 40H. A block of 40H contiguous I/O locations will be used starting from the selected address.

The I/O port addresses corresponding to each port are shown in the following.


5.5 Daisy Chain Interrupt

The daisy chain interrupts function provides more than one PC COM 8 port board to use the common interrupts.

The JP1 is used to identify master or slave board, and the JP2 (IN/OUT) is used to connect daisy chain.


JP1:  Select master or slave



Suppose you used one common interrupt to serve 24 ports, it must select one board as master board that generates interrupt, and the other two boards as slave. It shows how to connect daisy chain interrupt in the following.

NOTE  THAT, WHEN THE DAISY CHAIN FUNCTION IS USED, ONLY SET INTERRUPT (SWITCH 2) ON MASTER BOARD, DO NOT SET IRQ ON SLAVE BOARD.