Com Port

January 9th, 2007

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What is meant by "COM Port"? How many COM ports are there in a normal PC? Is COM port a hardware or software?

What are the criteria which affect the selection of com port when establishing a communication between PC and some other device(Say any finger print reader)? What are the COM ports available in a PC? What is meant when we say COM port1 or COM port2? Can a COM port be busy when there is no device connected to it?

COM ports were usually the serial, RS-232 ports. Most computers now don't even have the hardware for COM ports any more. However, you get "virtual" COM ports by installing device drivers, usually for USB devices that talk to the computer via serial communications. You can even buy USB to serial adapters (9 pin serial)

In the "old" days, most desktops has 2 COM ports (1 and 2) and most laptops had one (COM1). Now a days, desktops usually have no physical COM ports, but still have printer ports. Laptops now have neither COM or printer (LPT) ports any more.

If you have software looking for a COM port, it may reply "busy" if it can't find one, depending on how the code is written. Usually these apps say "device not found"

Find Com Port On eBay Below:

3Com 3C16465C 24 Port Ethernet Switch TESTED
3Com 3C16465C 24 Port Ethernet Switch TESTED
$24.95
3Com 3C16490 Baseline Switch 2226 PWR Plus 24 Port
3Com 3C16490 Baseline Switch 2226 PWR Plus 24 Port
$50.00
3Com 3CR17501 91 Superstack 3 Switch 3250 48 Port Switch
3Com 3CR17501 91 Superstack 3 Switch 3250 48 Port Switch
$50.00
NEW 3COM Gigabit IntelliJack 4 Ports Compact 100 1000 Wall Mount Switch NJ2000
NEW 3COM Gigabit IntelliJack 4 Ports Compact 100 1000 Wall Mount Switch NJ2000
$129.99
NEW Startech ICUSB2321X 1 Port Professional USB to Serial Adapter Cable with COM
NEW Startech ICUSB2321X 1 Port Professional USB to Serial Adapter Cable with COM
$33.98
ZENITH COM TO LPT PRINTINGCOM PORT ADAPTER EXTENSION 1980S FREE SHIPPING
ZENITH COM TO LPT PRINTINGCOM PORT ADAPTER EXTENSION 1980S FREE SHIPPING
$15.00
3COM 3C17203 24 Port Ethernet Switch
3COM 3C17203 24 Port Ethernet Switch
$13.88
4x StarTechcom USB3SDOCKDD Docking Station  Ports USB 30 DVI Ethernet
4x StarTechcom USB3SDOCKDD Docking Station Ports USB 30 DVI Ethernet
$78.99
MT VIKI 8 Ports 8 In 1 Out AV RCA Splitter Selector Switch Adapter MT 831AV Com
MT VIKI 8 Ports 8 In 1 Out AV RCA Splitter Selector Switch Adapter MT 831AV Com
$24.83
StarTechcom ST122W 2 Port Wall Mount VGA Video Splitter i6
StarTechcom ST122W 2 Port Wall Mount VGA Video Splitter i6
$17.30
Parallel DB25 Female COM Port  LPT  to IDC 26pin w Cable  Bracket For PC
Parallel DB25 Female COM Port LPT to IDC 26pin w Cable Bracket For PC
$8.95
Serial RS232 DB9 Male + DB25 Male COM Port to IDC w Cable  Bracket
Serial RS232 DB9 Male + DB25 Male COM Port to IDC w Cable Bracket
$9.95
Panduit DP6 Plus 24 Port Cat6 Patch Panel DP24688TP Data com wiring C6
Panduit DP6 Plus 24 Port Cat6 Patch Panel DP24688TP Data com wiring C6
$38.99
StarTechcom 6 ft Mini Display Port 12 Adapter Cable M M
StarTechcom 6 ft Mini Display Port 12 Adapter Cable M M
$9.00
3Com Baseline 10 100 Switch switch 24 ports
3Com Baseline 10 100 Switch switch 24 ports
$29.99
3COM 3C510013 STARTEK 299AT ACTIVE HUB 14 PORT COAX WITH WARRANTY
3COM 3C510013 STARTEK 299AT ACTIVE HUB 14 PORT COAX WITH WARRANTY
$142.50
Panasonic ToughBook CF 18 DFUP1395ZA DC IN Power Jack VGA COM Port Board Cable
Panasonic ToughBook CF 18 DFUP1395ZA DC IN Power Jack VGA COM Port Board Cable
$12.99
New Panasonic Toughbook CF 31 CF31 CF 31 COM Dust Plastic Port Base Case Cover
New Panasonic Toughbook CF 31 CF31 CF 31 COM Dust Plastic Port Base Case Cover
$9.99
3COM HP 3CFSU08 V1405 8 ETHERNET SWITCH 8 PORT 10 100 w power cord
3COM HP 3CFSU08 V1405 8 ETHERNET SWITCH 8 PORT 10 100 w power cord
$24.50
Compaq Presario 700 com port cover door
Compaq Presario 700 com port cover door
$3.99
HP 3COM 3C17260 JE075A 8 port 1000base X SFP module for 5500 Switch
HP 3COM 3C17260 JE075A 8 port 1000base X SFP module for 5500 Switch
$95.00
Brand New Sealed Bratz Be Bratzcom Mini Keyboard PC Compatible USB Port MGA
Brand New Sealed Bratz Be Bratzcom Mini Keyboard PC Compatible USB Port MGA
$6.79
4 Dell PR01X laptop docking station com port d620 d630 d830 latitude
4 Dell PR01X laptop docking station com port d620 d630 d830 latitude
$35.00
3COM 48 Port Gigabit Baseline Switch 2952 SFP Plus 3CRBSG5293 w Rack Ears
3COM 48 Port Gigabit Baseline Switch 2952 SFP Plus 3CRBSG5293 w Rack Ears
$79.95
3COM SUPERSTAK II DUAL SPEED HUB 3C16590 12 PORT
3COM SUPERSTAK II DUAL SPEED HUB 3C16590 12 PORT
$20.00
3Com Switch 4210G switch managed 24 ports
3Com Switch 4210G switch managed 24 ports
$69.70
3Com Switch 4210G switch managed 48 ports
3Com Switch 4210G switch managed 48 ports
$102.50
3COM 3870 3CR17451 91 SuperStack 3 48 Port Gigabit Ethernet Network Switch
3COM 3870 3CR17451 91 SuperStack 3 48 Port Gigabit Ethernet Network Switch
$56.70
3Com SuperStack 3C17300A 4200 26 Port Switch
3Com SuperStack 3C17300A 4200 26 Port Switch
$499.00
NEW Panduit Pan Net 48 Port Mini Com Modular Angled Patch Panel  CPPLA48WBLY
NEW Panduit Pan Net 48 Port Mini Com Modular Angled Patch Panel CPPLA48WBLY
$44.79
3Com Baseline Switch 2226 Plus 24 Ports Managed
3Com Baseline Switch 2226 Plus 24 Ports Managed
$22.00
VSCom USBG 8COM port serial adapter
VSCom USBG 8COM port serial adapter
$89.00
3Com IntelliJack NJ240FX switch managed 4 ports NEW OPEN BOX
3Com IntelliJack NJ240FX switch managed 4 ports NEW OPEN BOX
$56.95
3Com SuperStack II 3C16441 Baseline Hub 24 Port 1644 110 000 300
3Com SuperStack II 3C16441 Baseline Hub 24 Port 1644 110 000 300
$12.30
GFCI Module FrameMini Com2 PortIvory PANDUIT CFG2EI
GFCI Module FrameMini Com2 PortIvory PANDUIT CFG2EI
$7.49
STARTECHCOM PEX1P 1PORT PCI EXPRESS DUAL PROFILE
STARTECHCOM PEX1P 1PORT PCI EXPRESS DUAL PROFILE
$30.00
StarTechcom Mountable 4 Port Rugged Industrial USB Hub hub 4 ports
StarTechcom Mountable 4 Port Rugged Industrial USB Hub hub 4 ports
$14.00
3Com Switch SuperStack 3 4500 PWR 26 Port
3Com Switch SuperStack 3 4500 PWR 26 Port
$79.99
StarTechcom Converge A V 4 Port VGA and Audio over Cat 5 Video Extender
StarTechcom Converge A V 4 Port VGA and Audio over Cat 5 Video Extender
$175.00

Recently Purchased Com Port:


3com wx1200 wireless lan wx1200 3crwx120695a 8port ethernet switch, 3com nbx digital analog line card 3c10114c 655009203r 4 port ls loop start, usb to rh232 serial port 9 pin db9 cable serial com port adapter convertor jn, usb to rh232 serial port 9 pin db9 cable serial com port adapter convertor ln, 4 port wall mountable usb to serial adapter hub with com retention, panduit 12port minicom patch panel with integrated bracket cwpp12wbl black, 3com baseline switch 2848 sfp plus48 port 3c16486 w mounts amp; adapter e96, 3com baseline switch 2016 amp; 2024 wrack mount kit 24 port niob byg, startechcom 4 port pci 1394a firewire adapter card 3 external 1 internal, startechcom 1 port pci 101001000 32 bit gigabit ethernet network adapter c, startechcom hb30c3a1ge turn a laptopfeets usb typec port into three usb typ, startechcom pci2s232485i 2port pci serial adapter card, startechcom st4200usbm mountable 4port black metal, 3com 4 port gigabit multilayer switch 4007 3cb9rg4 mod 9000 3com corebuilder, 3com intellijack 3cnj220 4ports external switch managed with power adapter, lcom 32port cat 5e patch panel, the convertor adapter usb to rs232 serial port 9 pin db9 cable serial com port, startechcom 2 port vga video splitter 300 mhz video splitter 2 ports, startechcom 4 port usb 30 hub w usb c hb30c3a1cfs, 3com baseline switch 2024 switch 24 ports, 3com 3c16750a 8 port dual speed hub working with box power cord, startechcom 2 port mini displayport with usb kvm switch sv231mdpu2good, startechcom st4200usbm rugget industrial 4port usb2 hub w usb2 cable, 3com baseline switch 2250 plus switch managed 48 ports 3c16476cs, 3com superstack3 3c17304a 28port network switch, 3com 3cfsu08 v14058 ethernet switch 8port 10100, 3com 2952 sfp plus baseline 48port gigabit ethernet managed switch, startechcom st7300usb3b 7port 30 usb hub with power, startechcom 2 port flush mount expresscard 54mm superspeed usb 30 card adapter, startechcom 1 port pci express low profile parallel adapter card sppeppecp, startech 2 port usb to rs232 rs422 rs485 serial adapter with com retention, startechcom 2port dual kvm switch with audio for dvi computers builtin usb, startechcom 7 port pci usb card adapter pci to usb 20 controller adapter, 3com nbx call processor superstack 3 3c10239 4ports external switch , startechcom 1 port pci express dual profile parallel adapter card sppeppecp, hp jd542a msr 4port fxo mim module for 3com amsr router, 3com superstack 3 baseline hub hub 24 ports 0009, 3com officeconnect 3c16792a 16ports external switch, 3com nbx v3000 ip phone system 3c10600b 4port analog voicemail 512mb ram 40gb hd, 3com 3cblsf26pwrh 2426pwr plus baseline 24port poe switch , 3com officeconnect gigabit switch 16 switch 16 ports, 3com officeconnect dual speed switch 16 switch 16 ports, usb 16 channel relay moduleboard for home automation virtual com port 12v, 3com 3c16471b baseline switch 2024 switch 24 ports, startechcom 1 port expresscard to rs232 db9 serial adapter card w 16950 u, cidigc panduit plastic snapin port identifier minicom data icon gray 100, cidvlc panduit plastic snapin port identifier minicom data icon violet 100, cidorc panduit plastic snapin port identifier minicom data icon orange 100, startechcom 4 port high resolution vga video splitter 350 mhz video splitte, usb to rs232 serial port 9 pin db9 cable serial com port adapter cableconvertor, startechcom 3 port 2b 1a pci 1394b firewire adapter card with dv editing kit, startechcom 2 port low profile sata to esata plate adapter, 3com 3c17206 superstack 3 4400 se switch 24port, lot of 3 3com baseline switch 2948sfp plus switch 48 ports see description, 3com superstack iii network switch hub 4400 48 port, hl340 usb to rs232 com port serial pda 9 pin db9 cable adapter support win764w, startechcom usbc to gigabit network adapter and 4port usb 30 hub to 4x usba, 3com superstack 1 switch 1100 24 port 3c16950 , panduit 6port minicom surface mount box off white cbxd6iway new, 3com superstack 3 switch 4400 48 port switch new, startechcom 1 port pci express pcie gigabit nic server adapter network card, lot of 2 3com superstack 3 4500 pwr 50port poe managed switches, startechcom sv231dpu2 2port displayport usb 20 kvm switch, startechcom pexusb3s4v 4 port pci express pcie superspeed usb 30 controller ca

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