Actually, the large mainframe would have been a DTE as well. It is the
modem that is the DCE. The specification is really one for connecting
things to modems.
Initially PCs used 25 pin connectors and they were fairly rare in using
them with the correct gender, male (as defined by the pins) for DTE and
female for DCE. Even after the move to 9 pins, they continued to use
this convention. Therefore, if you have a device that has a male
connector, you can be pretty sure it is configured as a DTE. A female
connector, unfortunately, is not a guarantee of the converse, and the
K2, at least, appears to be non-compliant. It looks like the K3 has the
same non-compliance.
--
David Woolley
Owner K2 06123
On 14/12/15 23:08, Don Wilhelm wrote:
AFAIK the IBM PC was the first to use the DE-9 connector for the serial
port connector, and they initially envisioned the PC being used as a
terminal device connected to a large mainframe - so the mix-up began
there - thus the PC is a DTE device, and when things are run from a PC,
the signals are "backwards".
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