Which pins must be connected from 9 to 25 to make the modem run ? Transmit Data, Recieve Data, and Signal Ground as well as Protective Ground on one connector (computer side I think), but what about hardware handshake lines ? Or donīt such things exist any more ?
And which pin no of the 9 pin to be connected with which one of the 25 pin ???? I think the wire crosing is already done in the 9 pin cable, so I suppose there is no further crossing needed.
You should be able to get away if Tx, Rx and Gnd
if you can configure your modem driver to use software flow control. The issue of wire-crossing is a bit misleading. The IEEE specs
transposed the Tx and Rx pins on the 9-way connector
, so connecting pins 2-to-2 and 3-to-3 will give the effect of a "cross-over" cable. Pin 5 is signal ground on the 9-way, IIRC.
HTH.