RS232 Serial to USB: Connecting Electronic Scale: Software ?

I have a heavy duty 400lb capacity scale from Pelouze:
http://global.dymo.com/enCA/Products/400lb____180_Kg_Digital_Shipping_Scale__4040.html
It has a 9 pin Serial RS232 port on the side. I was looking to connect it to a G4 for the purpose of importing the displayed weight into a software package.
Preliminary research indicates I will need two things:
1. A Serial (male) to USB (male) adapter cable with a driver that will correctly communicate with the scale.
2. Software to graphically display the output of the driver.
The manufacturer does give some basic information on the serial connection:
Serial Cable Pinout:
Pin 3 = DATA
Pin 5 = COMMON
Communications Protocol:
Speed = 2400 Bps
Word Length = 8 bits
Parity = none
Stop bits = 1

Update:
Was hoping t use the Keyspan cable as I’ve seen it mentioned in several other boards for a number of years, but the POSIX API mentioned in their brochure for this product is no longer supported per the following statement form the company:
[quote]Unfortunately, this type of support is no longer offered, following the purchase of Keyspan by Tripp Lite a few years ago. It appears our marketing department failed to update the manual, deleting the Developer[quote]
So I opted for a TRENDnet product off Amazon for $12.00 that has high ratings. It uses one of the “chips” (PL-2303) you are suppose to use for this and it has Mac drivers. I believe it also has a little app used to set-up the initial connection or maybe I could use one of those BDAqua mentioned since I retain Classic for use with some old peripherals. The article below contains more information on this chip, although not this specific product:
http://www.planet-rcs.de/article/macserialport/
Looks like the next step would be to try to whip up a application in a old copy of Realbasic using the serial class to talk to the scale via the emulated serial port.
Thanks for the information!

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Thanks for your detailled description of the faxmodem installation!
I've tried this with Mac OS X v10.8 Mountain Lion and it works fine.
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RS232 Serial to USB: Connecting Electronic Scale: Software ?

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