CHAPTER 5
SWITCH SETTING


5.1 Compatible Mode

The first two serial ports are referred to as COM1: and COM2: which are standard ports for IBM PCs. If the PCCOM 4 port adapter is configured to emulate two standard ports by setting two of the four ports to be compatible with COM1: and COM2:. This is called compatible mode.


5.2 Enhanced Mode

The PCCOM 4 port adapter may be configured to coexist with the two standard ports, adding four ports for a total of six. This is called enhanced mode. Under the enhanced mode, a maximum of two adapters can be added to the system, which provides eight additional ports for a total of ten.
 


5.3 Add two PCCOM 4 Port Adapters




5.4 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.

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.





1.    I / O Address Selection

SWITCH 7,8: Select Compatible Mode or Enhanced Mode.




Default setting is in Enhanced mode (high address).


The mapping of I/O addresses to each channel are shown in below:



2.    Interrupt Selection

SWITCH 1, 2, 3, 4, 5, 6: Select interrupt line



In compatible mode, COM1: and COM2: automatically generate interrupts on IRQ4 and IRQ3 respectively.

3.    Select Wait State

JP1: Select Wait State



4.    Mode Selection

JP2: Mode selection







 To short the JP2, it enables 3F8 (IRQ4) and 2F8 (IRQ3) of this board. So that do  not short the jumper when your card is in enhanced mode, otherwise the system may generate both IRQ4, IRQ3 and IRQ that you set by switch. Only short it when compatible mode is set.  

5.    Select software interrupt or hardware interrupt

JP3: Mode Selection



 To short 1,2 means you must enable global interrupt (see chapter 7) by software. These setting is only used under Unix environment.
To short 2,3 means the hardware set global interrupt automatically (default). This setting is used under Non-Unix environment like DOS and Windows.