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The
destination of data for an Analog Output object will be writing
the remote Modbus register or remote BACnet server object via the map
indicated by the Device Link. The Modbus or BACnet device will be
updated upon change of source data and/or periodically as defined by
the Write Map. The
Analog Output object is commandable, meaning the external BACnet
client must write both a value and a priority level for that value. The
highest level value will be the one written to the Modbus register or
remote BACnet server object. If all values are relinquished, the
relinquish default value will be written to the Modbus register or
BACnet object. Out
of service means the Modbus register will not be written. Values
written by the BACnet client will be retained, but only applied
when this object is placed back in service. At that time, the highest
priority value will be written to the Modbus register. Reliability codes may be any of the following: Modbus client, no response (64) Modbus client, crc error (65) Modbus exception, illegal function code (66) Modbus exception, illegal data address (67) Modbus exception, illegal data value (68) Modbus exception, code+65, rarely used (69..79) Local device, configuration property fault (80) BACnet IP client, device timeout (82) BACnet IP client, error returned by server (83)
Status flags A,B,C,D indicate the following, 0 meaning not true, 1 meaning true: A = in alarm B = fault C = overridden D = out of service Device
link will indicate RTU or TCP for Modbus, or BIP for BACnet,
followed by R for read or W for write, and a number which is the rule
number in the table of read or write rules for mapping Modbus or BACnet
to this BACnet object. The designation R means read from Modbus or
BACnet, and W means write to Modbus or BACnet. |