On 03/17/2017 11:45 AM, Mike O'Connor wrote:
On 17/03/2017 1:48 PM, Woody Wu wrote:
I want to setup pppd to connect a Linux laptop to an embedded Linux
device. The Linux box connected to a rs-232 to rs485 converter, then
the convert connected via a two-wire rs-485 cable to the embedded
Linux device's rs-485 port.
This generally will not work as rs-485 is half duplex, the issue is that
the switching time between transmit and receive will mean loss of data,
how ever RS-422 will work.
On the otherhand, I can make success with similar commands when two
devices connected with rs-232. So I guess, this failure was because
the rs-485 is half-duplex. But I searched google, people seemed say
pppd should work over a point-to-point rs-485 connection. So I want
to get help from your experts.
I've not done any searches but I can not see how it could ever work. PPP
is a an async meaning it can transmit and receive at any time.
Thanks in advance.
One of the search result is this:
which Karthik mentioned he has success with the rs-485 point to point
connect although he still has problem with multi-drop bus. To me, I
only has interests in point-to-point and hope there exits a solution.
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