Installation & Operating Instructions
Building Automation Products, Inc., 750 North Royal Avenue, Gays Mills, WI 54631 USA
Tel:+1-608-735-4800 • Fax+1-608-735-4804 • E-mail:[email protected] • Web:www.bapihvac.com
Specifications subject to change without notice.
rev. 02/09/21
39021_RCV_900_BACnet_2020
9 of 12
900MHz WAM Connect
By default the gateway assigns the BACnet Object Instance ID for the first sensor starting at 1000. It will go up by 1000
for each additional sensor added, so the BACnet Object Instance ID for the second sensor will be 2000. If a sensor is
removed, the next sensor added to the system will have the lowest available default number. This is important to know
when replacing a sensor.
Notice in Fig. 13 on page 10 that each sensor has multiple objects related to it. For example, room sensor 9544 has a
BACnet Object Instance ID of 1000, so all the objects associated with it (temp, humidity, setpoint, etc.) will begin with
1000. As shown in the chart below, the object instance for the temperature value is always “0” so the temperature value
for the first sensor is 1000. The object instance for the Humidity value is always “1”, so the humidity value for the first
sensor is 1001. For the second sensor (749E), the temperature and humidity values are 2000 and 2001 respectively. Note
that the object instance is skipped if that value is not available from that sensor, so there is no 1003 or 2003 for the first
two sensors since neither of them has light level sensing.
You can assign your own BACnet Object Instance IDs for the sensors rather than taking the defaults assigned by the
gateway. However the IDs must be at least 10 numerals apart from each other. If you do not assigned them at least 10
apart, the system will not recognise them. For example, if you assign BACnet IDs for three sensors as of 6000, 6001 and
6002, the second two sensors will not save on the system because their IDs are already being used as the humidity and
setpoint or Barometric pressure values for the first sensor. Instead you must assign numbers that are at least 10 apart
from each other, such as 6000, 7000 and 8000 or 6000, 6010 and 6020.
BACnet Object Instance Chart
Object Type
.....
Object Instance
..........
Object Description
Analog Input ................. 0 .......................Temperature in °C or °F
Analog Input ................. 1 .......................Relative humidity in %RH
Analog Input ................. 2 .......................Setpoint for room sensors / Barometric pressure in kPa for non-room sensors
Analog Input ................. 3 .......................Light level in LUX
Analog Input ................. 4 .......................Battery voltage level in volts
Analog Input ................. 5 .......................Received wireless signal strength in dBm
Binary Input .................. 6 .......................Occupancy override status
Analog Ouput................ 9 .......................Heartbeat check (described on page 11)
Note: the object instance is skipped if that variable is available from the sensor, so there would be no “2” value for a
sensor without humidity measurement.
The “Radio Tab” (Fig 10) on Edit Link Sensor Window lets you edit
the following:
• Network:
The network address of the sensor assigned by the
gateway
• AES Key:
This is the AES encryption used between the gateway
and device assigned by the gateway
• Channel:
This is the radio channel the sensor is using. Assigned
by the gateway
• Power level:
dBm level of the radio. 0 dBm will yield good battery
life. Default = 0 dBm. Adjustment range = -30 to +5 dBm.
• Interval:
Is the time between transmissions in seconds.
300 sec = 5 min. Default = 5 min. Adjustment range = 30 sec to 15
min.
• Battery:
The voltage at which the battery is going to stop
transmissions due to an expiring battery.
Note: Once the battery drops below 3 volts, the battery is very
close to end of life and should be replaced.
Setup continued...
Fig. 10:
Radio Tab on Edit Link Sensor Window