TEMPERATURE AND RH OFFSET
This device allows for a temperature offset of +/-5C (9F) and an RH offset of +/-10%. By default, these
values are set to 0, meaning no offset is added.
These are set by writing to the present value of the Temperature Calibration Offset (AV0) or RH Calibration
Offset (AV1). The value written must be within the specified range or an error will be returned. To set back
to factory settings, write any changed values to 0.
Automation Components, Inc.
2305 Pleasant View Road | Middleton, WI 53562
Phone:
1-888-967-5224 |
Website:
workaci.com
Page 6
TEMPERATURE UNITS CONFIGURATION
For temperature, the units of measure can be configured using
BACnet. By writing to the units property of the temperature sensor
(AI0), the reported temperature units can be changed.
TABLE 5
shows the values to write.
PAR 2
0
0
1
1
PAR 1
0
1
0
1
Mode (Databits-Parity-Stop Bits)
8-Even-1
8-Odd-1
8-None-2
8-None-1 (Non-Standard)
TABLE 7:
PARITY AND STOP BITS
Note: The table shows all objects for Temperature and RH. If you have a Temperature only model, the RH objects(AI-1 and
AV-1) will not be present. If you have a RH only model, the Temperature objects (AI-0 and AV-0) will not be present.
TABLE 5:
UNIT SETTING
UNITS
°F
K
°C
VALUE
64
63
62
OBJECT TYPE
Device
Analog
Inputs
Analog
Values
BACnet ENGINEERING UNITS
- - - - - - - - - - - - - - - - - - - - - - - - - -
degrees-Fahrenheit (64) - default
percent-relative-humidity (29)
delta-degrees-Fahrenheit (120)
percent-relative-humidity (29)
PIC STATEMENT QR
RANGE
0-4194302
34.7 - 122.0
0.0 - 95.0
-9.0 - 9.0
-10.0 -10.0
OBJECT NAME
BN211x0
Temperature Sensor
RH Sensor
Temperature
Calibration Offset
RH Calibration Offset
OBJECT ID
- - - - - - - - - -
AI-0
AI-1
AV-0
AV-1
TABLE 6:
BACnet OBJECT TABLE
DEVICE CONFIGURATION THROUGH MODBUS RTU
MODBUS RTU DATABITS,
PARITY, AND STOP BITS
SELECTION
Confirm Modbus Protocol is selected via
dipswitch #4 on SW4 - see
FIGURE 8 (P.4)
. The
device that requests information is called the
Modbus Master and the devices giving the
information are Modbus Slaves. The Modbus
sensors are slave devices and the number of Data
Bits needs to be the same as in the Master device
configuration. ACI’s Modbus RTU sensors utilize 8
data bits during communication exchange.
Parity and stop bit selection is performed via the
SW4 switch located on the board. Dipswtiches #1
and #2 are adjusted to select the parity and stop
bits - see
TABLE 7
. Where (0) is OFF and (1) is ON.
If BACnet protocol is selected these dipswitches
are irrelevant.
TEST MODE Modbus RTU
There are 5 data values in test mode. Coil 1001,
Holding Registers (HR) 1001 and 1002, and the
Input Registers (IR) 0003 and 0004 for Temp and
RH values. When Coil 1001 is enabled, reading IR
0003 and 0004 will respond with the values in HR
1001 and 1002, other wise they will respond with
the actual sensor values. General process for this
is to write initial test values to HR 1001 and 1002,
Enable Coil 1001 and then read as normal from IR
0003 and 0004. While Coil 1001 is enable, it is
possible to write a change of value to IR 1001 and
1002, which will be reflected in the next read from
IR 0003 and 0004. When testing completed,
disable Coil 1001. The status of Coil 1001 and HR
1001 and 1002 are not persistent between
reset/power cycle.
Version: 2.0
I0000929
