2.2. DESCRIPTION
The use of 1 wire digital sensors eliminates the influence of cable length on the measurement process that usual affects analog
methods of temperature, humidity or pressure measurement and signal processing. Digital sensors transmit the measure value by
data transfer protocol and this simplifies connection wiring of a large number of sensors and improves the detection of faulty
components. Traditionally, it has been difficult to operate 1-WIRE data bus sensors in industrial environments. The solution to this
problem is ADA-401WP addressable measurement module with MODBUS-RTU protocol. The ADA-401WP is robust and modular in
design to operate 1-WIRE sensors in a industrial controller environment.
Using ADA-401WP as a addressable node of 1-WIRE bus lets extend the distance up to 1200m between 1-WIRE devices and PC
with monitoring software e.g. SCADA or other MASTER type device (PLC controller). ADA-401WP is equipped with a screw terminal
blocks for twisted pair connections 1-Wire bus and RS-485, as well as for power. Overvoltage protection on each RS-485 line is made
on the basis of 600W protectors diodes and fuses. To RS485 Bus can be connected 32 devices ADA-401WP.Additional converter
like ADA-I1040 (RS232 to RS485) or ADA-I9140 (USB to RS485) enables monitoring of the modules via RS232 or USB interface of
PC with software as AdaUtil or SCADA.
Using:
- the ADA-4040 repeater to connect another 32 modules and extend RS485 bus up to 1200m,- the ADA-4044H HUB RS485, to
connect up to 128 modules, change RS485 bus topology from linear to star - Each arm of the star can have length 1200 meters
- ETHERNET to RS485 converter (ADA-13040) or Wi-Fi to RS485/422 converter (ADA-14040) you can connect ADA-401WP modules
of any location to monitoring or controlling systems.
The ADA-401WP offers a low power wide input voltage range from an external source of greater than 10V to a maximum of 30V and
can be delivered from power pack (e.g. DR-15-12). The module has built in reverse polarity protection to protection against opposite
polarization of power supply.
Fig. 1. ADA-401WP view
5
ADA-401WP
62mm
Power Supply
10 - 30 VDC
9
0
m
m
53mm
1
0
m
m
1
0
m
m
(SW1)
G
N
D
T
X
+
/A
T
X
-
/B
R
X
+
R
X
-
(RS485/RS422)
RS-485 4-wires
or RS-422
RS-485
2-wires
N
C
N
C
N
C
N
C
V
D
D
1-
W
G
N
D
N
C
(1-WIRE)
V
-
V
+
10 – 30
VDC
1-WIRE bus
PWR
TX
RX
ADA-401WP
MEASURING MODULE
1-WIRE TO MODBUS-RTU
1-WIRE
