ioSelect WMR-900, Руководство по эксплуатации

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© ioSelect Inc. CONFIDENTIAL 25
io Select
EtherWave - WMR
4.0 Operating Modes
An EtherWave-WMR may be configured for any operating mode:
this is very convenient for purposes of sparing and becoming familiar
with their configuration menus.
4.1 Master
One per network, the source of synchronization for the system. The
Master controls the flow of data through the system.
4.2 Repeater
Required only if necessary to establish a radio path between a Mas-
ter and Remote(s); stores and forwards the data sent to it. Synchro-
nizes to Master and provides synchronization to ‘downstream’ units.
If a local device is attached to a Repeater’s serial data port, the Re-
peater will also behave as a Remote (aka Repeater/Remote).
As they are added to a radio network it is good practice to use the
values 2-17, sequentially, for Repeater Unit Addresses.
Adding one or more Repeaters within a network will HALVE the
throughput; the throughput is halved only once, i.e. it does not de-
crease with the addition of more Repeaters.
If there is a ‘radio (signal) path’ requirement to provide Repeater
functionality, but throughput is critical, the repeating function may be
accomplished by placing two EtherWave-WMR at the Repeater site
in a ‘back-to-back’ configuration. One EtherWave-WMR would be
configured as a Remote in the ‘upstream’ network; the other a Mas-
ter in the ‘downstream’ network. Local connection between the mo-
dems would be accomplished with a crossover cable (for the
ethernet connection). Each modem would require its own antenna;
careful consideration should be given with respect to antenna place-
ment and EtherWave-WMR configuration.
4.3 Remote
Endpoint/node within a network to which a local device is attached.
Communicates with Master either directly or through one or more
Repeaters. See Sections 5.3 and 5.4 for information regarding
‘Slave-to-Slave’ communications.
Throughout this manual,
‘
R emote’ refers to a R emote
as defined in Section 4.4; the
general term ‘
r emote’ applies
to an EtherWave-WMR
Repeater and/or Remote - i.e.