AR500 User’s Manual
LLL00xxxx – Rev 1.0
16
6.
Analog Output Operation
AR500 sensors can be ordered with either 4-20mA or 0–10 V analog outputs.
The analog outputs use the same two wires. Please refer to Section 4.4 for
connection details.
The analog output is updated with each sample measured. The analog output
will deliver a current which increases linearly from 4 mA (or 0 volts) at the range
beginning point to 20 mA (10 volts) at the range end point.
6.1
Analog Output ON (01h)
The analog output can be toggled ON / OFF. The factory default setting is ON
(value=1).
The values for code parameter 01h are 1/0 for ON/OFF. If a sensor is not
configured with an analog interface, the value will always be set to 0 despite
any attempts to change it.
6.2
Analog Output Mode (02h bit R)
The analog output can be operated in two modes, “Window Mode” or “Full
Mode”. The factory default mode is “Window Mode” Where: the window size is
set to the full span of the sensor (its measurement range).
"Window mode" - The value of bit R is 0. This is the default mode. The
entire range of the analog output is scaled within the selected window. Outside
the window, the analog output is "0".
"Full mode" - The value of bit R is 1. The entire range of the analog output is
scaled within the selected window. Outside the selected window, the whole
range of the analog output is automatically scaled onto the whole operating
range of the sensor.
6.3
Analog Output Working Range (0Ch, 0Dh, 0Eh, 0Fh)
Resolution of the analog output can be increased by adjusting the window size
and location within the measurement span. The analog signal will be scaled
within this window only.
If the beginning of the range of the analog signal is set at a higher value than
the end value of the range, this will change the direction of rise of the analog
signal.
0Ch
– Low byte for the BEGINNING of the analog output range. Default value
is 0. Value range: 0 - 4000h. This code specifies a point within the sensor’s
span Where: the analog output has a minimum value.
0Dh
– High byte for the BEGINNING of the analog output range. Default
value is 0. Value range: 0 - 4000h. This code specifies a point within the
sensor’s span Where: the analog output has a minimum value.
0Eh
– Low byte for the END of the analog output range. Default value is
4000h. Value range: 0 - 4000h. This code specifies a point within the
sensor’s span Where: the analog output has a maximum value.
