Contemporary Controls BASstat BAST-221C-BW2, Руководство пользователя, Страница: 20 / 42

UM-15090500-AA1 Page 19
A current temperature value can be assigned thru BACnet AV-1 to take place of
the onboard temperature sensor value. The assigned value is valid if BACnet
communication is driving a flip-flop signal to (BV-16: heartbeat signal) within the
(AV-29: Heartbeat Rate time) period (in seconds). Otherwise, the assigned
temperature will revert back to the onboard sensor reading.
Occupancy Setting
There are three ways to define thermostat occupancy state. NOTE: Occupancy will be
detected by ESI contact by default.
• Energy Savings Input (ESI) This is a dry contact input meant for communication
from a customer supplied occupancy sensor. (default)
•
Occupancy status (occupied/unoccupied) can be set by a BACnet supervisor
using writable object
ESI Contact Definition
[
BV14
]. “0” for occupied, and “1” for
unoccupied. E12/AV18 must be set with a value of 64 (disabled) in advance
(E12/AV18 is set as 0 by default)
• User control of occupancy state is allowed from the SET button if E12/ AV18
Lock has the ESI Contact disabled. Pressing the SET button and UP/DOWN
buttons will toggle the occupancy state. Press SET button to confirm. The SET
button can work in conjunction with BACnet occupancy Command [ BV14 ] on
last-write-wins basis. The SET button could be locked to limit user control (use
Lock [ AV18 ] BACnet object or ( LOC ) engineering menu item to lock SET
button). In this case only the BACnet supervisor can set occupancy states.
• Occupancy Status
[
BI0
] is a read-only BACnet object indicating current
occupancy state - “0” for occupied, and “1” for unoccupied. (AV18 is set as 0 by
default).
•
When in unoccupied state, a Moon ( ) icon will be displayed on the LCD and
the thermostat will change the set-point temperatures to the
Unoccupied Cool
and
Unoccupied Heat
setpoints [
AV8 – 9
]. When the state changes back to
occupied, the thermostat will return to the occupied set-point values for
Cooling
and
Heating Temperature Setpoint
[
AV0, AV3
] and a sunlight icon ( ) will be
displayed to indicate occupied state on LCD.
4.3 Engineering Mode Menu
Thermostat configuration can be performed using the engineering mode menu described
below or BACnet objects using a BACnet client tool such as Contemporary Controls free
BACnet Discovery Tool (BDT). It is highly suggested that engineering mode be operated by
trained installers only, because it is related to system parameters that will affect the control
results.
Operation of Engineering Menu
•
At power “ON”, press and hold both the UP and DOWN buttons simultaneously
for 5 seconds to enter Engineering Mode menu.
• Press the UP or DOWN buttons to rotate through the menu items. The last item