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17. Generally RS485: Does every RS485 interface receive an own IP-address?
No. Because several senders work together at the same line, it must be
protected via a protocol that maximum one data sender is active on same
time. All other senders must be at this time in high-impedance status.
18. Allgemein RS485: I added an ipEther232 with RS485 to the bus system. Why doesn't it
work?
With the installation must be paid attention to correct polarity of the pairs of
veins, since a wrong polarity leads to inverting the data signals. Particularly
with difficulties in connection with the installation of new end devices each
error location should be begun with the examination of the bus polarity.
19. ipEther232: Is it possible to be accessed from several computers at the same time
to one virtual Com-Port?
No, only one computer has access ability at the same time. All further
receive the message: "ACCESS Denied" (program-specific expenditure).
20. ipEther232.PPP: Is it possible to handing over ipEther232.PPP the announcing
information (username and password)?
No, password examinations such as PAP or Chap are momentarily yet not
supported by ipEther232.PPP.
21. ipEther232.PPP: Can I connect two networks with your products?
Yes with two ipEther232.PPP which steer a simple routing via GSM -, ISDN
-, or analog modems.
22. ipEther232.PPP: How can I make a serial device Ethernet able (TCP/IP-able)?
With ipEther232.PPP. PPP must be configured for this (under Linux: pppd,
under Windows: Telecommunications connection.) P.S.: If only the serial
device can accessed, it can be used ipEther232 (virtual Com haven), too.
23. Tools: PortMon (GUI-Tool for monitoring all serial port activity on a system.)
PortMon. Sometimes with all serially attached devices it can come to
groundless communication problems. In such a case it is helpfully be
supervised and analyzed the data communication to the serial device to
eliminate possible errors.
Portmon is a GUI/device driver combination that monitors and displays all
serial and parallel port activity on a system. (For a clearly Analysis it should
be only one device monitored.) Download PortMon:
http://www.sysinternals.com/ntw2k/freeware/portmon.shtml
24. Tools: Ethereal or CommView (programs for the monitoring of the network
(LAN).)
Ethereal or CommView. In some cases communication between network
and ipEther232 functions not as desired. To find out whyy, there are
software tools such as Ethereal or CommView.
Ethereal is a free network protocol analyzer. It allows you to examine data
from a live network or from a capture file on disk. (For a clearly Analysis it
should be only needed transmission paths monitored.)
Download Ethereal:
HTThttp://www.ethereal.com/distribution/win32/TTH
CommView is a program for monitoring Internet and Local Area Network
(LAN) activity capable of capturing and analyzing network packets.
Download CommView:
HTThttp://www.tamos.com/download/TTH
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