10 Nov
2015
10 Nov
'15
5:06 a.m.
On 2015-11-10 11:55, Christian Corti wrote:
On Mon, 9 Nov 2015, Johnny Billquist wrote:
Yes. The signals exist, because you might be connecting to a modem. But
they are not used for flow control. You can control what is output, and
you can check what comes in. But the hardware do not act on any of this.
If you write your own software then you can of course do things based on
those signals...
Johnny
Normally, you'd call them Tx, Rx and GND, but
anyway...
No, you do not need to loop back any signals. DEC didn't like to abuse
modem control for flow control.
What about the connections between the TTL signals and the line
drivers/receivers? There are definitley such connections to be made in
the Berg connector (like TTL SERIAL DATA IN on connector pin E). For EIA
you need to connect pin E with pin M. (See also page 178 in the
microcomputer interfaces handbook [1980]).