Solution:

I.The Feature of COM port The PCM-5862E/L provides four serial ports in one 40-pin maleheader connector,you can find the pin assignments of it on page 88 in 1st edition user's manual for your devices application. COM1/COM3/COM4 is fixed in RS-232 mode and COM2 can be configured in RS-232,RS-422,or RS-485 mode,to set that via J14 and J15 as following diagram. The IRQ and address range for the four comports are fixed. If you wish to change the setting or disable the port,you can modify it from "Integrated Peripheral"in CMOS setup. The default setting shows as below: II. COM port function test guide A.How to setup serial port for Windows 95/NT? [ For Windows 95 ] 1. [Start] -> [Setup] -> [Control Panel] -> [Add New Hardware] 2. Click [Next], choose [N]ot to do auto search new hardware. 3. Click [Next], choose [Connection Port (COM & LPT)] Hardware Type. 4. Click [Next], select [Standard Connection Port Type] for manufacurer and [Communication Connection Port] for model. 5. Click [Next], then the default IRQ and IO Address will be shown. Click [Done]. Up to this point you have added a port to system without correct IRQ and IO settings. You can repeat step 1 to step 5 to add as many ports as you want (Max. 128 port). 6. [Control Panel] -> [System] -> [Device Manager] 7. Select your new COM?, then [Resource] 8. Select the ??? as [Basic Configure 8]. 9. Double click on IRQ to type in (select) the hardware IRQ, then [OK] 10. Double click on I/O rage to type in (select) the hardware I/O, then [OK]. Repeat step 6 to step 10 to setup each port correctly. 11. Click [OK] 12. Restart Windows 95 [ For Windows NT ] Similar to Windows 95. You add new serial port in the Control Panel. B.How to test serial port unde