Best 1 Port Rs232

StarTech.com 4 Port Native PCI Express RS232 Serial Adapter Card with 16550 UART - Low Profile Serial Card (PEX4S553), Green

Add 4 RS-232 serial ports to your standard or small form factor computer through a PCI Express Expansion Slot.
Native single-chip, single lane PCI Express chipset delivers true PCIe performance, up to 48% more efficient than bridge chip designs.
Standard and low profile/half-height brackets included to ensure fitment in any system.
Four high speed RS232 serial ports, with support for data transfer rates up to 128000bps.
256-byte deep FIFO per transmitter and receiver.
Native single-Chip, single lane PCI Express.
Includes half-height/low profile mounting brackets.
Compliant with PCI Express Base Specification 1.1.

DTECH DB9 serial cable female to female connects your computer to device with RS-232 compatible (COM port) interface.
RS232c cable 9 pin connector on each end equipped with screws to ensure an easy and solid connection for stable data communication.
10 feet DB9 extension cord is long enough for unites side by side.
the wires inside the cable are of 30AWG gauge and easy to solder to.
It is pin-to-pin wired as a DB-9 serial adapter Straight Through (pinout :1-1, 2-2, 3-3, 4-4,......, 8-8, 9-9, G-G).
10ft DE9 RS232 serial adapter cord for some old RS232C equipment like scanner, Modem, printer, plotter, switches, camera, barcode / embroidery machine, touchscreen, microcontroller, test equipment.

Connects USB 2.0 to RJ45 Cat5 Ethernet port via one console cable and one RS232 cable.
Compatible with Cisco routers, including the 600, 800, 1600, and 1700 series.
Console Cable Length: 1.8 m (approximately 6 ft.).
Package Contents: 1 x USB to RS232 Serial Interface Cable, 1 x RS232 9-Pin Serial to RJ45 Cat5 Ethernet Cable.

15 ft serial male to female cable extends a COM port connection between your computer and some old device with RS-232 compatible so you can move rs232 device further away from your PC.
Long Serial extension adapter m/f equipped with screws on each end to ensure an easy and solid connection for stable data communication.
The wires inside are of 30AWG gauge and easy to solder to, and they connect to the pins in the order of the standard wire color code.
It is pin to pin wired as a DE9 rs232 Straight Through COM cord (pinout :1-1, 2-2, 3-3, 4-4,......, 8-8, 9-9, G-G).
15 feet serial male to female extension cable for hooking up RS232C equipment like scanner, Modem, printer, plotter, camera, barcode / embroidery machine, touchscreen, microcontroller, test equipment.

HOST INTERFACE: RS232(D_SUB 9-pin male) ,The adaptor eliminates your conventional RS232 serial cables, Bluetooth wireless serial port adaptor, is the....
Bluetooth classical V3.0 ,Class 1 Bluetooth RS232 Adapter with with external antennal,Support up to 100 meters (line of sight).
BAUD RATE: 1.2K~1382.4Kbps,Supports 4.8/9.6/19.2/38.4/57.6/115.2/230.4 Kbps The factory settings is 9600bps (default),You can reprogram Baud rate by....
Communicating Interface: D_SUB 9-pin Male ,Standard RS232 five-wire serial mode (RxD, TxD, RTS, CTS, GND).
Power: Plug power supply and DB9 seat power supply, 6 ~ 9V 500mA rated current.

1.5ft female to female serial null modem cable (7 wire type and full handshaking) connects your computer to device with COM port RS-232 compatible interface.
Wired as a 9 pin serial port Null-Modem cord that 2-3, 4-6, 7-8 line are cross linked (TX,RX,RTS, CTS, DTR,DSR wires are connected).
standard shielded DE9 rs232 cable female to femalewith AL foil.
DB9 female to female connector on each end equipped with screws to ensure an easy and solid connection for stable serial cross data communication.
The wires inside are of 30AWG gauge and easy to solder to, and they connect to the pins in the order of the standard wire color code.
1.5 feet short null serial adapter f/f for hooking up PC laptop to some old RS232C equipment like scanner, Modem, printer, plotter, camera, barcode / embroidery machine, touchscreen, microcontroller, factory test equipment.

MAXIMIZED PORTABILITY: This USB to serial RS232 adapter with FTDI features a single cable design removing the need for additional adapters and cables.
CORRECT DTE/DCE CONFLICTS: Convert your available USB port into a null modem RS232 DB9 serial port, resolving any DTE/DCE conflicts.
BROAD COMPATIBILITY: Compatible with your USB 1.0 or 2.0 ports, this RS232 converter works with your Windows, Mac or Linux systems.
FAST TRANSFER SPEEDS: Experience fast speeds with this serial adapter, supporting a Baud Rate up to 921.6Kbps.

HOW IT WORKS: TECHTOO USB to Quad Port RS232 DB9 Serial Adapter is Designed for Connecting to Serial Devices Such As DB9 Equipped Serial Modems, ISDN Terminal Adapters, Digital Cameras, Label Writers, Palm PCs, Barcode Scanners, PDAs etc Through USB port with 1Mbps Data Transfer Rate.
CONNECTORS: With Standard USB Type A Male to Standard 9-pin DB9 RS-232 Serial MALE Connector with Hexnuts.
CONDUCTOR & SHIELDING: Tinned Copper Conductor and Triple Shielding Ensure the Best Data Transfer Rate. Powered by USB Port, No External Power Adapter Required. Simple Installation, Plug & Play after One Time Driver Installation ( Product come with a Driver CD ).
CHIPSET & SUPPORTED OS: FTDI FTDI232RL Chipset for Widest Possible Stablity and Compatibility with Windows (10/8.1/8/7XP), Mac, Linux, etc. Support Almost All Serial COM Port.
12 Month WARRANTY: USB 2.0 to Serial (9-Pin) DB-9 RS-232 Converter Cable is Backed with 12 Month Warranty and Customer Service Support.

Add a parallel port and two RS-232 serial ports to your PC through a PCI expansion slot.
2S1P PCI Serial Parallel Combo Card with 16550 UART.
PCI RS232 Serial Card plus Parallel Port.
2x Serial and 1x Parallel Adapter Card / PCI Serial/Parallel Card Adapter / Serial RS232 Adapter Card with Parallel Port.
All three ports share only one IRQ which minimizes the system resources required to operate the card.