Re: Handshake cable

[toddpw@beat.ugcs.caltech.edu (Todd P. Whitesel)]

fl332@cleveland.Freenet.Edu (John L. Graham) writes:

>host. On the hardware handshaking cable I bought from Alltech the
>1 <--> 4 line was connected, but 4 wasn't jumpered to 20 on the DB-25.
>Sooo, I installed the jumper myself and it worked fine.

You could also have told your modem to ignore DTR, which is pin 20.

I just got done wiring up one of these cables with no jumpers; I left
pin 20 alone since my modem's default is to ignore DTR, and I connected
MiniDIN pin 8 to DB-25 Pin 1 -- this connects the other polarity RX data
line to 'frame ground' which on my modem is at the same potential as the
signal ground, so it acts like a jumper. This may not be true of all modems
-- frame ground technically is not supposed to be connected to electrical
ground, but rather to earth or chassis ground. Devices with neither of those
(like my modem which is powered by a brick) usually just connect both grounds
together.

Todd Whitesel
toddpw @ ugcs.caltech.edu