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Options for Adding Serial Ports The serial port is prevalent on PC's
as well as scores of industrial, scientific and consumer devices,
making it a convenient starting point for communications.
Since RS-232 itself is only suited to short connections (50
ft. max.) many applications require that it be adapted to
fit requirements. RS-422, typically used for extending RS-232
communications, provides full duplex communications between
two devices. It can also provide one way communications from
one master to several slaves. RS-485 communications standard
allows cable lengths up to 4000 feet. It also provides very
high noise immunity. Multidrop connections up to 32 different
nodes can be made over a single twisted pair cable along with
a signal ground connection.
This article summarizes the choices a
system designer has when adding a serial (RS-232, RS-422,
or RS-485) communications device. There are many different
ways to add additional serial ports to your Desktop PC, Palm,
or Laptop PC. USB, PCMCIA, PCI and ISA are some of the methods
that will be discussed.
The Universal Serial Bus (USB) provides
a high data rate and Hot Swap connection for PCs, providing
an easy connection to a wide variety of multimedia and network
USB devices. Generally considered to be for home or office
use, USB is finding its way into Industrial applications.
PCMCIA Serial Ports are yet another way
to add serial ports to a PC that has PCMCIA Slots available.
Most Laptops today offer only one (if any at all) DB9 type
serial ports. A PCMCIA Serial Card is a good way to add a
serial port (or ports) to any laptop that is low on available
serial ports (RS-232, RS-422 or RS-485).
PCI Cards are becoming more popular as
a way to add serial ports to desktop PC's. PCI type slots
are becoming the "norm" in standard PC's today, and PCI Serial
Cards are an excellent way to add serial ports. The standard
Desktop PC may only come with one serial port standard (if
any serial ports at all). PCI Serial Cards use Software Drivers
to address the ports to the PC.
ISA Cards are yet another way to add
serial ports to the older desktop PC's. ISA type slots are
becoming scarce in standard PC's today, but are still an excellent
way to add serial ports. The ISA Cards are typically addressed
using dip switches and shunts or jumpers to set IRQ's for each
port. No Software Drivers are required with ISA style serial
cards.
Palm OS PDA's may be connected to RS-422
or RS-485 data circuits using Palm adapters. These adapters
offer total portability for collecting data and field service
chores. The Palm device and the adapter will usually slip
into a shirt pocket. Some models use the PDA's connecting
cable, some include a cable and some are cradles that allow
the PDA to nest in place and connect directly to the Palm
base socket. PalmTerm Freeware allows you to transmit and
receive data from the Palm serial port.
yes, unfortuantely they do wear out (in/out connecting) ..thats why i always suggest using a USB hub (retails for about $10-$15 or less) -- plug it into one USB port and leave it (if its a desktop, dont try this with notebook or you will forget its there and cause damage while moving it around, from one place to another)
-try blowing out the dust from the inside USB connection of your computer , try it again -- but buy a USB hub first ,, youc ant go wrong having this around
is it a desktop ? if so , buy a new USB card and replace the old one
if its a notebook -- bad news , you need to spend money to replace the USB ports or buy another mainboard
You can't have a double hook up to it,When the parallel port is used the usb port is disabled and when you use the usb port the parallel port is disable.This is done to prevent damage to the printer.You can network the laptop with the pc and print that way though
Check your USB ports with another device like a flash drive.
Reset your USB ports:
Here is what you can do to refresh the USB ports: 1. Right click MY COMPUTER 2. Select PROPERTIES 3. Select HARDWARE 4. Select DEVICE MANAGER 5. Select UNIVERSAL SERIAL BUS CONTROLLERS 6. Right click on each USB CONTROLLER and select Uninstall 7. Uninstall all entries 8. Reboot your computer 9. As your computer re-boots it will reinstall all USB connections it detects THEN, when all other USB items have been configured and connected by the system, you then should try connecting your USB drive.
If your USB ports are working, download and install the new version of Destop Manager and HotSync @
reset your TX before you attempt to sync it with the PC after you download the new version of the software.
Click on this link or copy and paste the complete link into your browser. If I could be of further assistance, let me know. If this helps or solves the issue, please rate it. Thanks, Joe
You can usually get these at most any computer store, if there are none in your location I suggest searching ebay for "palm pilot PC interface cable" or "palm pilot docking cradle"
Go to my computer, right click -> Properties -> Hardware -> Device Manager.
Locate your IQUE 3600, or Palm.
Now, if your palm has a Yellow Exclamation mark on it, that means that your computer is not recognizing the Palm. Select Driver details. Re-install the driver off the "Setup CD" that came with your IQUE 3600.
I have the same problem, but with TWO z22s. Both are about a week old, and both "talked" seamlessly to the computer. Suddenly neither does. Do not see anything wrong with USB port or cable. Uninstalled all PALM OS from desktop and reinstalled. Still no link.
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