The Win7 laptop beside me has a back-panel COM1 port set to
Its Device Manager has an entry for "Ports (COM & LPT)."
Port Settings > Advanced accepts settings for COM1 to COM256. COM3
thru COM6 are "(in use)", the upper two for a USB cellular modem that
appears as two virtual COM ports.
On Saturday, September 20, 2014 8:25:00 AM UTC-7, Karl Townsend wrote:
PinOuts.ru should have the wiring specs.
If you use an RS-232 to USB adapter, some don't use real RS-232 voltage lev
els, like -3V to -15V for a logical true and +3V to +15V for a logical fals
e, but use 0V for a true, and that doesn't work with some equipment. I'd e
xpect adapters based on Cypress chips to be OK, but apparently the first ch
oice is an FTDI brand chip, and they have driver software for every operati
ng system. I think StarTech brand adapters are still good, but Cables Unli
mited was also selling FTDI adapters that worked well.
You would have to try a straight thru cable or some need a null modem.
This page claims you can run Hyperterminal on Win7 or maybe you nave an
old laptop or old computer that has LAN port you can use as to connect
I have prob 10 old mobo's w/comm ports squirreled away for this reason.
Depends on whether it is doing handshaking.
The minimum is (for the DB-25 connectors)
If it is a DE-9 connector instead -- on many newer computers)
the pin numbers change, and I don't work with those much.
Data Ground from pin 7 to pin 7
Data leads: (assuming a crossover, with both ends the same time
2 - 3
3 - 2
If there is more needed (handshaking) add:
5 - 6
6 - 5
and maybe tie pin 20 on each end to one of the two before.
And to be sure to deal with voltage differences between the two
chassis -- safety ground from pin 1 to pin 1.
No experience with Windows 7 -- sorry. (Nor with much of any
other Windows, for that matter.) Way back when, I liked kermit for the
transfers between unlike computers.
For unix machines, I would usually use tip or cu -- but those
are unlikely to be found on a Windows box.
you will need a null modem cable and a232port on a computer. there are
some usb to 232 adapters but not all will work properly because of
voltage differences. I have a box of new null modem cables 15 ft if you
need one. I ordered three cables and they sent me three bags of three.
You will also set your baud rates to match as well as the other
parameters, stop bits, data bits, parity and some other stuff so the two
units can communicate.
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