Product manual

TAC Xenta Server – Gateway, Technical Manual B Protocols
Schneider Electric Buildings AB, June 2011 153 (184)
04-00124-06-en
B.5.2 BACnet MS/TP Interface
The BACnet MS/TP interface driver is added into the network pane of
XBuilder, as shown for a SrlSim example network in the following
screenshot.
Interface Properties
• Port Type – In most cases the RS-485 port option will be selected.
The RS-232 option may be suitable for connecting to a single
device such as a router or simulator, but RS-485 will be required if
more than one device is directly connected to the Xenta 913’s
serial port.
• Baud Rate, Parity, #Data Bits, #Stop Bits – All the communica-
tion parameters, such as baud rate and parity, must be the same as
that of the target half-router.
• This Master’s Address – Allows the Xenta 913’s master address
to be entered (0–127). The entered number should correspond to
the unique address of the Xenta 913 on the MS/TP network. Any
address not in use by another master can be used.
• Maximum Master Address – Allows the maximum expected
address of any master to be entered (0–127). The entered number
should be set to just include the maximum number of masters
expected on the network, as this will reduce the amount of time
required to establish network communications on start-up. Setting
a lower number also reduces the token passing overhead during
normal operation.
• Write Priority – Allows an optional write priority to be entered
(3–16, with 3 being the highest priority and 16 the lowest). Can be
used to assign the gateway application’s priority versus other
applications should they also write a value to a single object. Nor-
mally left at the default Write Priority of 12.
Note
• All master devices that allow it should have the same maximum
master address setting.