Product manual

B Protocols TAC Xenta Server – Gateway, Technical Manual
154 (184) Schneider Electric Buildings AB, June 2011
04-00124-06-en
The entered priority is sent with all object value write requests. If the
target object is not commendable then the priority is ignored and the last
written value is applied. However, if the target object is commendable
then the highest priority written value is applied, while lower priority
values are ignored.
Interface Status Signals
The BACnet MS/TP interface driver generates several network specific
communication status signals, as described below.
• ComsFail – Flags a complete communications failure. Activated
only if communications has failed to all slaves on the MS/TP net-
work.
• ObjsFail – Flags if communications has failed to one or more
objects on the MS/TP network. Normally objects fail because an
incorrect device address or object instance number has been
entered. However, output objects may also fail as a result of
attempting to write an out-of-range value to it.
• online – Flags ONLINE during normal network communications,
and will change to OFFLINE only if communication has failed to
all slaves on the MS/TP network. An OFFLINE condition nor-
mally indicates incorrect communication property settings, or
faulty wiring of the network between the Xenta 913 and the slaves
on the MS/TP network.