CHAPTER 5

SWITCH SETTING

5.1 Introduction

The six jumper blocks on the PCCOM ISA bus 2 port adapter must be configured correctly in accordance with the operating system you are using.

JP1 (Jumper 1)

Determines the I/O address of port 1.

JP2 (Jumper 2)

Determines the I/O address of port 2.

JP3 (Jumper 3)

Enable selected interrupt. The selection of this jumper should correspond to the selection of JP4 and JP5.

JP4 (Jumper 4)

Select interrupt for port 1. The range is from IRQ2 to IRQ15.

JP5 (Jumper 5)

Select interrupt for port 2. The range is from IRQ2 to IRQ15.

JP6 (Jumper 6)

Select delay wait state.

5.2 Configuration for Dip Switch and Jumper

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.

M  IMPORTANT: CARE MUST BE TAKEN IN SELECTING THE CONFIGURATION OF JUMPERS AND SWITCH 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 and jumper block. If you are installing more than one board, do not duplicate jumper settings for any parameter.

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JP1 and JP2 are used to select UART I/O address for each port. Where JP1 is used to select port 1 address, JP2 is used to select port 2 address. Each JP contains A9 to A3 jumper pins and EN jumper pin. The A9 to A3 are used to set I/O port address, when the corresponding pin is short means 0, otherwise no pin short means 1.  The figure above set the I/O address to 2A0H. The EN pin is used to enable the selected port, not short the jumper means enable the port, otherwise, if you short the jumper means disable this port.

Ø     The default setting of this board are:

2. Interrupt Selection

  JP4 is used to select interrupt for port 1 and JP5 is used to select interrupt for port 2. It can arrange these interrupts in any combination, this means it can set all ports in different interrupt, however do not share the same interrupt. The figures shown above is to set interrupt on 12.

3.Common IRQ

 The JP3 is used to enable IRQ2 to IRQ15 bus lines.  Note that the selection of this jumpers should correspond to the selection of the interrupts on the JP4 and JP5. For example, if you select IRQ5 and IRQ10 on the JP4 and JP5, you need short IRQ5 and IRQ10 of JP3.

4.Select Wait State

The JP6 is used to select delay wait state.

5.3 Standard COM1 and COM2 ports

If you want to set the adapter as standard COM1 and COM2, please refer the following settings.