MicroNet SP9121 Manual Página 134

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B Protocols TAC Xenta Server – Gateway, Technical Manual
134 (184) Schneider Electric Buildings AB, June 2011
04-00124-06-en
Notes
•The R and R/W I/O options should only be selected for the regis-
ter types that are described as having read and write capability in
the preceding Register Number table.
In a few cases it may be necessary to control a coil or holding
registers value, in which case I/O should be set to Write-only
(W) or Read/Write (R/W). These settings allow the master to
read to the pseudo registers within the Xenta 913, effectively
allowing these to be written out to the master by the LON or
I/Net control system.
The Modbus Slave driver does not distinguish between
Write-only and Read/Write signals, so normally Write only
would be selected to indicate that one-way data flow is expected.
However, Read/Write can be selected to indicate that bi-direc-
tional data flow is possible.
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