APAR AR553, User Instruction

Page: 9 / 12

9
Table 9.2. Configuration parameters for the RS485 version
Parameter Range of variability of the parameter and description
Default
settings
0:
cALo
calibration of the zero
point for temperature
[°C]
-20.0
÷
20.0 zero point offset 0.0
[°C]
1:
cALg
calibration of the
inclination for temperature [
%]
85.0
÷
115.0 sensitivity (gain) 100.0
[%]
2:
Addr
MODBUS address
1
÷
247 MODBUS address of the device 1
3:
br
transmission speed
0.6
÷
115.2
transmission speed [kb/s], for the RS485 and the AR956
programmer
2.4
10. MESSAGES AND ERROR SIGNALING
a) measurement errors:
Code Possible causes of error
^^^^ the measurement range of the sensor is exceeded from the top
____
the measurement range of the sensor is exceeded from the bottom
----
no communication with the sensor (the sensor is defective or the electrical connections are broken)
b) other messages:
Code Description of message
ConF the parameter configuration menu was accessed
11. CONNECTING THE CONTROLLER TO A COMPUTER AND AVAILABLE SOFTWARE
It may be useful (or necessary) to connect the transducer to a computer in order to configure parameters, which
also enables copying the setting to other transducers of the same type.
As a standard, the transducers are equipped with a
PR port which enables connection to a computer using an
AR956 programmer using the MODBUS-RTU communication protocol and the following transmission parameters:
speed = 2,400 bit/s, MODBUS address = 1.
The following application is available (on a CD supplied with the AR956 programmer or to be downloaded from
the Internet at
www.apar.pl , “Download” section, for operating systems Windows Vista/7/8/10):
Name Software description
ARsoft-CFG
(free)
- display of current measurement data from the connected device
- setting configuration parameters, such as the measurement range of the output,
the communication options, etc.
- creation on the disk of a "cfg" file with the current configuration of the parameters for
future use (copying of configuration)
- the software requires communication with the device via the
PR port (AR956 or AR955)
A detailed description of the aforementioned application can be found in the installation folder.
NOTE:
Before a connection is established, make sure that the MODBUS address and the transmission speed in the options
of the ARsoft software are the same as the settings of the device (this applies to the version with the RS485).
Moreover, in the options of the ARsoft software, set the number of the COM serial port in use (in the case of the
AR956/AR955 programmer or the RS485/USB converter, it is the number assigned by the operating system during
installation of the drivers).
!