Install and test PCI 2 Port RS232 Photo Isolator Card on
Red Flag
1.Download Device Driver

You must login as a root user.

And do it in the ' text-mode ' or use the Terminal of System tools in ' graphic-mode '.

(1). For ttyS44 to ttyS75



Use 'uname -a' command to check your kernel's version.

2. Install Device Driver

This sample is under REDHAT 8.0 KERNEL 2.4.18-14.

2.1 DIP Switch

The switch is used to identify card number, default setting is card 1. There are two methods to set the card number:

2.2.1 PnP mode

Just plug in PCI bus adapter into PCI slot, the PCI BIOS will allocate I/O address to each adapter automatically and assign card number start from 0 to each adapter. However, if you plug in more than one adapter, please set whole adapters to card number 1 (default setting), then use software tools to distinguish port id.

2.2.2 Manual mode

Set card number by card identifier switch, the PCI BIOS will assign pre-allocated I/O address to each adapter. Please set different card number to each adapter (do not duplicate card number setting).

2.3 Instal1 step

Please follow as follows to instal1 the driver.

Step 1: Extract the file

After extracting, it creates three files.

Step 2: Replace two files --- serial.c and serial.h

First: Backup original file.

Second: Overwrite it.

Step 3: Build the Linux Kernel with the driver.

First : make menuconfig

(1). Choose ' Character devices '.

(2) Choose ' Extended dumb serial driver options ', ' Support more than 4 serial ports ',
     ' Support for sharing serial interrupts ' and ' Support special multiport boards '.

(3). Select < exit > .

(4) Select < Exit > .

(5) Select < Yes > .

Second : make dep

Third : make bzImage

It will create and bzImage files. Then replace the files.

(1) Remove the link file .

(2) Copy /usr/src/linux-2.4/ file to /boot .

(3) Copy /usr/src/linux-2.4/arch/i386/boot/bzImage file to /boot. And rename ' pccom '.

      It will create ' pccom ' file.

Fourth : Edit boot menu. The following example is lilo boot menu.

The normal configuration file is located in /etc/lilo.conf.

You must add new image to boot and backup original image.

After making changes to /etc/lilo.conf, you must run lilo to make changes to go in effect.

Step 4: Make the device nodes if they are not existent. Use ' ls ttyS* ' command to  check.

The corresponding nodes are :

ttyS44  ttyS45(cau44  cau45) for the first 2 port card .

ttyS52  ttyS53(cau52  cau53) for the second 2 port card .

ttyS60  ttyS61(cau60  cau61) for the third 2 port card .

ttyS68  ttyS69(cau68  cau69) for the fourth 2 port card .

After Making, use ' ls ttyS* ' command to check them.

Step 5: Please reboot systems.

After rebooting system. Lilo will give two selections : ' linux ' and ' oldlinux '.

Choose ' linux ' to boot. Doing nothing will casue ' linux ' to boot.

Step 6: You can use ' dmesg | more ' command to check it is working or not . .

And use ' cat /proc/pci ' command to find the device .

3.Self test the card
You must prepare two konsoles . And use DB9F to DB9F cable to connect the RS-232/422/485 Card and PC COM1.






The Konsole (RS-232/422/485 Card) sends the data and the Konsole <2> (COM1) receives the data.

First: Use ' cat < /dev/ttys0 ' to receive the data. Then press ' Enter '.

Second: Send ' THIS IS TEST! ' from /dev/ttyS44 (RS-232/422/485 Card). Then press ' Enter '.

Third: The Konsole <2> will anto receive ' THIS IS TEST! '.

Fourth: send ' 123456789 ' from /dev/ttyS44 (RS-232/422/485 Card). Then press ' Enter '.

fifth: The Konsole <2> will anto receive ' 123456789 '.

sixth: Press ' Ctrl + c ' to stop .


The Konsole (RS-232/422/485 Card) receive the data and the Konsole <2> (COM1) send the data.

First: Use ' cat < /dev/ttys44 ' (RS-232/422/485 Card) to receive the data. Then press ' Enter'.

Second: Send ' TEST ! ' from /dev/ttyS0 (COM1). Then press ' Enter '.

Third: The Konsole (RS-232/422/485 Card) will anto receive ' TEST ! '.

fourth: Press ' Ctrl + c ' to stop .