Serial Port
Serial Port
 |
 Syba SD PEX15022 PCI express 2 Port DB 9RS 232COMSerial Moschip 9901  US $18.79
|
 Digi Edgeport 4s MEI Serial Adapter USB RS 232422485 4 Ports 301 1000 94 US $333.52
|
 Syba 6Port Serial RS232 DB9 PCI Controller Card Adapter US $35.53
|
 CompUsa 271773 High Speed PCI Card Serial Ribbon Port US $9.99
|
 Syba PCI 8 Serial Ports Controller Card8 Port RS 232 Octopus Fan Out 17 Cable US $43.29
|
 Syba PCI e To 2 Port DB9 Serial Pot Controller Card With Low Profile Bracket US $18.79
|
 Syba SD PCI15029 8 DB 9 Serial Port PCI Controller Card25 Pin Octopus Cable 17 US $47.96
|
 New 2 Port DB 9 Serial PCI e Controller CardLP Bracket US $17.85
|
 Syba SD PEX50030 PCIe 2x Serial DB9 Port 1x Parallel US $16.95
|
 EQUINOX Avocent 950357 002 REV A 8 PORT SUPER SERIAL PCI ADAPTER US $15.00
|
 BRI4520 Boca Research VIC 1 Serial 4 port ISA Card US $119.95
|
 Lot of 2 x Cisco WIC 2T Cisco 2 Port Serial WAN Interface Card US $70.00
|
 4x RS 232 DB9 COM Serial Ports I O PCI Controller Card US $24.19
|
 Rosewill PCI serial 2x serial port DB9 I O card Netmos 9835 CV chip RC 301 US $19.00
|
 StarTechcom 4 Port Native PCI Express RS232 Serial Adapter Card with 1 PEX4S952 US $103.99
|
 StarTechcom 1 Port RS 232 422 485 Serial over IP Ethernet Device Ser NETRS2321E US $107.99
|
 Cisco 2 Port Asynchronous Synchronous Serial WAN Interface Card Exp HWIC 2A S US $351.99
|
 StarTechcom 4 Port PCI Express RS232 Serial Adapter Card with 16950 UA PEX4S950 US $102.99
|
 Startech 2 Port Native PCI Express RS232 Serial Adapter Card With 16550 UART US $39.30
|
 CISCO NM 1HSSI 1 PORT HIGH SPEED SERIAL US $20.00
|
 StarTechcom 4 Port RS232 PCI Express Serial Card w Breakout Cable PEX4S553B US $86.99
|
 Cisco WIC 2T 2 Port Serial WAN Interface Card 36 Month Warranty US $35.00
|
 Startechcom EC2S55254 2 Port Serial Adapter Card US $79.73
|
 StarTechcom 6 ft 1 Port RS422 RS485 USB Serial Cable Adapter Serial ICUSB422 US $61.99
|
 Startechcom PEX2S950 2Port PCIE Serial Card US $61.88
|
 CISCO NM 8A S 8 PORT SERIAL MODULE US $40.00
|
 StarTechcom 2 Port Low Profile PCI RS 422 485 Card Serial adapter PCI2S485LP US $88.99
|
 Startechcom EC1S1P55254 2 Port Serial Parallel Combo Adapter Card US $82.11
|
 Startechcom PCI2S4851050 2 Port PCI Serial Adapter Card US $91.84
|
 Startechcom PEX4S553B 4 Port PCI Serial Adapter US $95.89
|
 NEW MANHATTAN 2 port PCI Express Serial Adapter 2 x 9 US $31.24
|
 Cisco 4 Port Serial A S Serial NM Card NM 4AS NM 4A S ASYNC SYNC US $25.00
|
 LAVA Computer 8 Port PCI Serial Card MPN OCTOPUS 550 US $123.99
|
 Digi Neo 8 Port DB 25 Multiport Serial Adapter 70002312 US $150.00
|
 SYBA 2 DB 9 Serial RS 2321 DB 25 Parallel Printer LPT1 Ports PCI Card US $16.99
|
 Syba 6Port Serial RS232 DB9 PCI Controller Card Adapter US $28.19
|
 Startechcom PEX8S952 8 Port Native PCI Express RS232 Serial Adapter US $188.59
|
 StarTechcom 4 Port USB to RS232 Serial DB9 Adapter Hub ICUSB2324 US $60.00
|
 Startechcom PEX8S950LP 8Port PCI Express Low Profile Serial Adapter Card US $188.59
|
 Laptop PCMCIA 2 Ports Serial ATA SATA RAID CardBus Card US $19.90
|
 New BB Electronics PCMCIA RS 232 Serial Port US $70.00
|
 Tripp Lite USB 4 Port Serial ROHS MPN USA 49WG US $136.99
|
 Startechcom PEX2S553 2 Port Native PCIE RS232 Serial Adapter Card with 16550 US $47.88
|
 Syba SY PCI15002 32 bit PCI 4 DB 9 Serial RS 232 Ports Controller Card US $24.49
|
 Syba SD PCI15029 8 DB9 Serial Ports PCI Controller Card US $43.29
|
 StarTechcom 1 Port Native ExpressCard RS232 Serial Adapter Card with 16 EC1S952 US $61.99
|
 Startechcom PEX2S952 2Port Native PCI Express RS232 Serial Adapter Card US $56.12
|
 950357 002 Equinox Avocent 8 Port Serial PCI Adapter 950357002 US $215.00
|
 910254 B Equinox Avocent 8 Port Super Serial PCI Adapter 910254B US $215.00
|
 NEW Syba SD PEX15021 Serial RS232 COM1 DB9 port PCI Express PCIe Card US $17.59
|
 PCI to 8 port PCI DB9 serial RS232 controller card WIN7 US $45.00
|
 Laptop PCMCIA 2 Ports Serial ATA SATA RAID CardBus Card US $18.65
|
 PCI Card with Dual DB9 Serial Ports PCI 2DB9 US $19.95
|
 Cisco WIC 2T 2 Port Serial WAN Interface Card US $59.00
|
 HWIC 1T Cisco 1 Port Serial WAN Interface Card US $225.00
|
 SYBA IO Card SD PEX15011 4 Port Serial RS 232 PCIEx1 Card Retail US $35.37
|
 Cisco WAN Interface Card 2 Port Serial Expansion module US $75.00
|
 SYBA IO Card SD PEX15011 4 Port Serial RS 232 PCIEx1 US $28.79
|
 Laptop PCMCIA Dual Ports Serial ATA SATA RAID CardBus Card US $19.26
|
 EQUINOX SST 4P RJ11 4 PORT PCI SERIAL ADAPTER 950378 001 REVA US $199.99
|
 NI PCI 8430 2 RS 232 2 PORT SERIAL INTERFACE RS232 US $105.00
|
 SIIG JJ P04621 S7 4 port Multiport Serial Adapter US $87.46
|
 EQUINOX SST 16P 910277 D 16 PORT PCI SERIAL ADAPTER US $55.00
|
 Perle Systems 4003170 Speed4 Le Express HD 4 Port PCI Express Serial Card US $163.53
|
 SYBA 2 DB 9 Serial RS 2321 DB 25 Parallel Printer LPT1 Ports PCI Card US $18.70
|
 StarTech PEX2S553B 2 Port RS232 PCIE Serial Card with Breakout Cable Retail US $40.18
|
 MOXA CP 102U 2 port RS 232 smart PCI serial boards US $49.95
|
 Syba SD PCI15029 8 DB 9 Serial Port PCI Controller Card25 Pin Octopus Cable 17 US $43.29
|
 COMPAQ 228655 001 T1 E1 DUAL PORT SERIAL PCI CONTROLLER US $134.41
|
 Laptop PCMCIA 2 Ports Serial ATA SATA RAID CardBus Card US $19.21
|
 QUATECH 930 3012 01D SERIAL PORT PCI CARD US $110.00
|
 SG XPCIE8SAS I Z 8 Port 3Gbps Serial Attached SCSI HBA US $199.00
|
 StarTech CB4S950 4 Port 16950 Serial CardBus Adapter US $134.66
|
 CISCO 2DS3 PA 2T3 SERIAL 2 PORT ADAPTER CARD MODULE 73 2323 02 REV A0 DS3 US $9.98
|
 10xST Lab I 142 2 Port Serial PCI Cards PCI I09835 2S 2 US $49.90
|
History of USB Port Explained, USB Port simplifed
USB Port Explanation
Everyone that has used a PC or laptop will have used this ports without themselves knowing.
The history of the USB port goes back to the period of 1990s where several connection interface exist such as serial port, parallel port, ps2, etc. With so many interfaces, a typical user will need different cables for each separate connection.
USB(Universal Serial Bus) was created to standardize all the different interfaces, hence the word “universal”
With the standardization of different interface, the USB port has more tasks to complete – to increase their transfer rate between the host and devices connected to it.
USB started off on specification USB1.0 in 1994, followed by USB1.1, and finally USB2.0 in 2000
The various transfer speed of the specification is as follows
USB1.0 – 1.5Mbit/s
USB1.1 – 12Mbit/s
USB2.0 – 480Mbit/s
As of writing, USB3.0 Specification was in the midst of discussion and the transfer speed is rumored to be at 5000Mbit/s!!
The increase in transfer speed was mainly meant for transferring of data between devices. As USB hard disk expands in capacity, and users are demanding for better video quality, naturally, video file sizes are increased. Thus the birth of USB3.0
The first commercial product released for USB flash drives, commonly known as thumbdrive, in 2000. Back then, flash storage was at a measly 128mb. At time of writing, 2009, 1.5TB (1,500GB or 1,500,000MB) already exists!
If we were to transfer a single file of 5Gb on usb1.1 specs, on theory, we will need 3333s, which will take around 55min!! and 83s on a USB2.0 Specs.
Over the years, different companies develop different interface for USB devices as well, which somehow defeats the purpose of standardizing a common interface. However, the problem of different interface was not as serious as it was back in 1990s.
USB cable was able to carry power and to power up devices such as thumbdrive, webcams, external hard disk, usb speakers, etc. However, power is capped at 5v, 100mA.
USB cables suffer from a “useful” distance. Meaning, the maximum length of a usb cable is capped at 5m. Should the length be longer, the efficiency dropped and data may be corrupted.
For PCs with limited USB ports, a hub, typically with 4 additional USB ports, may be purchased. This will indirectly increase 3 more USB ports on your computer. However, take note that the bandwidth and power of each port on the USB hub will be reduced, as all its bandwidth and power are sourced from a USB port.
Common problems faced from using a USB hub, slower transfer rate and the inability to power up external 2.5” hard disk as they require more power as compared to a usb webcam or usb speaker.
That is all to wrap up for the topic and history for USB. I hope that the above computer guide will assist you in having a further understanding of USB history.
For more information about computers, do visit S-Mall Computer Article Section.
If you are purchasing computers in Singapore, do drop by our website http://www.s-mall.com.sg
PR:
wait...
I:
wait...
L:
wait...
LD:
wait...
I:
wait...
Rank:
wait...
C:
wait...
About the Author
Nick Lee is a consultant for a computer website at http://www.s-mall.com.sg and has assisted many on their technical issues.
How can I modify a keyboard to fit a serial port?
I have an old computer, and it has a serial port for the keyboard input. However, I don't have such a keyboard. Is there any way I can ingeniously modify either the keyboard or the input on the motherboard to fit in a normal ps/2 keyboard
I'm sure there is, however, you may want to consider just buying an adapter.
They are are cheap as $1.19 on eBay:
http://shop.ebay.com/items/_W0QQ_nkwZps2Q20toQ20serialQQ_armrsZ1QQ_fromZQQ_mdoZQQ_sopZ12
regards,
Philip T
Locker Control System via Serial Port
