Etherpoll User’s Guide
4
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Whenever the host computer polls the remotes, a copy of
the poll block is sent to each remote in the host Etherpoll’s
address list.
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The proper remote RTU will respond to the poll through its
EtherPoll with a poll response or appropriate data blocks,
while other RTUs ignore the poll.
Point-to-Point Mode
This mode requires one pair of EtherPolls. Each EtherPoll is
connected to a serial port device, and to the LAN.
Each EtherPoll has only one IP address in its IP address list
(that of the other unit). All data received by the RS-232 port of
either EtherPoll is sent to the other EtherPoll and out its RS-
232 port.
Broadcast Mode (Point-to-Multi-Point)
Point-to-multi-point (
broadcast
) operation allows a single
EtherPoll to broadcast all incoming data to multiple EtherPolls.
Configuration is identical to the normal mode, but since non-
polling external devices are used, there is no implicit method to
control data being sent back to the host unit. For this reason, it
is normally used in “outbound broadcast data only”
applications.
Normal Mode with Backup Polling Host
This mode is also similar to the normal mode, but allows a
redundant polling host computer to monitor all data traffic, and
take control for fail-safe operation should the master host fail.
Configuration changes from normal mode are simple. Each
remote EtherPoll would have both the master and backup host
EtherPoll IP addresses in its IP address list. The master host
Summary of Contents for EtherPoll
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