HBM PW15iA Mounting Instructions
Mounting Instructions | Montageanleitung |
Notice de montage
English Deutsch Français
PW15iA
Hottinger Baldwin Messtechnik GmbH
Im Tiefen See 45
D-64239 Darmstadt
Tel. +49 6151 803-0
Fax +49 6151 803-9100
info@hbm.com
www.hbm.com
Mat.: 7-2002.4359
DVS: A4359-1.0 HBM: public
1.2016
E Hottinger Baldwin Messtechnik GmbH.
Subject to modifications.
All product descriptions are for general information only.
They are not to be understood as a guarantee of quality or
durability.
Änderungen vorbehalten.
Alle Angaben beschreiben unsere Produkte in allgemeiner
Form. Sie stellen keine Beschaffenheits- oder Haltbarkeits
garantie dar.
Sous réserve de modifications.
Les caractéristiques indiquées ne décrivent nos produits
que sous une forme générale. Elles n'impliquent aucune
garantie de qualité ou de durablilité.
Mounting Instructions | Montageanleitung |
Notice de montage
English Deutsch Français
PW15iA
Digital Load Cell
English
1 Safety instructions 4........................................
2 Markings used 8............................................
2.1 Symbols on the transducer 8..................................
2.2 The markings used in this document 8..........................
3 Structure and mode of operation 10...........................
3.1 Layout 11....................................................
3.2 Signal conditioning 12.........................................
3.3 Adaptive interference suppression 13............................
3.4 Inputs and outputs 14.........................................
3.4.1 Trigger function 14............................................
3.4.2 Filling and dosing 15..........................................
3.4.3 Limit value function 15.........................................
3.4.4 Extreme value functions 15....................................
4 Conditions on site 16........................................
4.1 Protection against corrosion 16.................................
4.2 Deposits 17..................................................
5 Mechanical installation 18....................................
5.1 Important precautions during installation 18......................
5.2 Mounting and load application 19...............................
5.3 Dimensions 21...............................................
6 Electrical connection 22......................................
6.1 Cable laying 22...............................................
6.2 Pin assignment 22............................................
6.3 Supply voltage 24.............................................
6.4 Digital inputs 25..............................................
6.5 Digital outputs 26.............................................
2 A4359-1.0 HBM: public PW15iA
7 Interfaces 27................................................
7.1 RS‐485 4‐wire interfaces (UART) 27............................
7.2 CANopen interface 29.........................................
7.3 DeviceNet interface 30........................................
8 Operation via software 32....................................
9 Waste disposal and environmental protection 32..............
PW15iA A4359-1.0 HBM: public 3
Safety instructions
1 Safety instructions
Appropriate use
Transducers of the PW15iA type series are designed
solely for technical weighing applications within the appli
cation limits detailed in the specifications. Any other use
is not appropriate.
Any person instructed to carry out installation, commis
sioning or operation of the transducer must have read
and understood the Operating Manual and in particular
the technical safety instructions.
In the interests of safety, the transducer should only be
operated by qualified personnel and as described in the
Operating Manual. It is also essential to comply with the
legal and safety requirements for the application con
cerned during use. The same applies to the use of
accessories.
The transducer is not intended for use as a safety com
ponent. Please also refer to the "Additional safety pre
cautions" section. Proper and safe operation requires
proper transportation, correct storage, siting and mount
ing, and careful operation.
Operating conditions
S Please observe the allowed maximum values stated
in the specifications for:
- Limit load
- Limit load at max. eccentricity
- Limit lateral loading
- Breaking loads
- Temperature limits
4 A4359-1.0 HBM: public PW15iA
Safety instructions
- Limits of electrical loading capacity
S Please note that when several transducers are
installed in a scale, there is not always an even distri
bution of load on the individual transducers.
S The transducers can be used as machine elements.
When used in this manner, it must be noted that, to
favor greater sensitivity, the transducer is not
designed with the safety factors usual in mechanical
engineering.
S The design or safety engineering of the transducer
must not be modified without our express permission.
S The transducer is maintenance-free.
S In accordance with national and local environmental
protection and material recovery and recycling regula
tions, old transducers that can no longer be used
must be disposed of separately and not with normal
household garbage, see Section 9, Page 32.
Qualified personnel
Qualified persons means persons entrusted with the
installation, fitting, commissioning and operation of the
product who possess the appropriate qualifications for
their function.
This includes people who meet at least one of the three
following requirements:
S Knowledge of the safety concepts of measurement
and automation technology is a requirement and as
project personnel, they must be familiar with these
concepts.
S As measurement or automation plant operating per
sonnel, they have been instructed how to handle the
machinery. They are familiar with the operation of the
PW15iA A4359-1.0 HBM: public 5
Safety instructions
equipment and technologies described in this docu
mentation.
S As commissioning engineers or service engineers,
they have successfully completed the training to qual
ify them to repair the automation systems. They are
also authorized to activate, ground and label circuits
and equipment in accordance with safety engineering
standards.
Working safely
S The transducer must not be directly connected to the
power supply system. The supply voltage must be
between 12 and 30VDC.
S Error messages should only be acknowledged once
the cause of the error is removed and no further dan
ger exists.
S Maintenance and repair work on an open device with
the power on may only be carried out by trained per
sonnel who are aware of the dangers involved.
S Automation equipment and devices must be designed
in such a way that adequate protection or locking
against unintentional actuation is provided (e.g.
access checks, password protection, etc.).
S For those devices operating in networks, safety pre
cautions must be taken both in terms of hardware and
software, so that a line break or other interruptions to
signal transmission do not cause undefined states or
loss of data in the automation device.
S After making settings and carrying out activities that
are password-protected, ensure that any controls that
may be connected remain in a safe condition until the
switching performance of the device has been tested.
6 A4359-1.0 HBM: public PW15iA
Safety instructions
Additional safety precautions
Additional safety precautions to meet the requirements of
the relevant national and local accident prevention regu
lations must be taken in plants where malfunctions could
cause major damage, loss of data or even personal
injury.
The scope of supply and performance of the transducer
covers only a small area of measurement technology.
Before starting up the transducer in a system, a project
planning and risk analysis must first be implemented,
taking into account all the safety aspects of measure
ment and automation technology so that residual risks
are minimized. This particularly concerns personal and
machine protection. The transducers cannot implement
any safety-relevant cutoffs. In the event of a fault, the
relevant precautions must establish safe operating condi
tions.
General dangers of failing to follow the safety
instructions
The transducer corresponds to the state of the art and is
failsafe. The transducer may give rise to residual dangers
if it is inappropriately installed or operated.
PW15iA A4359-1.0 HBM: public 7
Markings used
2 Markings used
2.1 Symbols on the transducer
CE mark
The CE mark enables the manufacturer to guarantee that
the product complies with the requirements of the rele
vant EC directives (the Declaration of Conformity can be
found on the HBM website (www.hbm.com) under
HBMdoc).
Statutory waste disposal mark
In accordance with national and local environmental pro
tection and material recovery and recycling regulations,
old devices that can no longer be used must be disposed
of separately and not with normal household garbage.
Also see Section9, Page 32.
2.2 The markings used in this document
Important instructions for your safety are specifically
identified. It is essential to follow these instructions in
order to prevent accidents and damage to property.
Symbol Significance
WARNING
Notice
8 A4359-1.0 HBM: public PW15iA
This marking warns of a potentially dangerous situa
tion in which failure to comply with safety require
ments can result in death or serious physical injury.
This marking draws your attention to a situation in
which failure to comply with safety requirements can
lead to damage to property.
Emphasis
See …
Important
Information
Markings used
SignificanceSymbol
This marking draws your attention to important infor
mation about the product or about handling the prod
uct.
This marking draws your attention to information
about the product or about handling the product.
Italics are used to emphasize and highlight text and
identify references to sections, diagrams, or external
documents and files.
PW15iA A4359-1.0 HBM: public 9
Structure and mode of operation
3 Structure and mode of operation
PW15iA digital load cells are part of the family of elec
tronics developed by HBM for static and dynamic weigh
ing processes. The measuring element is a steel loaded
member to which strain gages (SG) are applied. The SG
are arranged so that two are stretched and the other two
compressed when a load acts on the load cell. The
PW15iA digitally conditions the signals and delivers a
fully-filtered, scaled and digitized output signal for direct
connection to bus systems or PCs via the RS‐485 inter
face, CANopen, or DeviceNet. Measuring element and
electronics are housed in a single enclosure. The digital
load cells can be quickly and easily matched to a particu
lar system by various parameters, and they work with an
internal data rate of up to 1200 measurements per sec
ond.
The inbuilt digital inputs and outputs allow event-driven
weight determination, e.g. for checkweigher applications
or dosing controls. The digital outputs can be configured
by software command, and can be used to control coarse
flow and fine flow in dosing valves, for example.
The PanelX PC software is available to facilitate parame
ter settings, to display dynamic measurement signals and
for comprehensive frequency analysis of the dynamic
system.
This document describes the installation and functions of
the digital load cell. The commands for the interfaces can
be found in the online documentation for the PanelX pro
gram.
10 A4359-1.0 HBM: public PW15iA
3.1 Layout
Structure and mode of operation
PW15iA
A
D
EEPROM
Linearization
Serial number
Digital filter
Data rate
Sensitivity
Zero value
Voltage
control
Interface
μP
I/Os
Supply
voltage UB/GND
Interface
RS-485/CANopen
IO
Trigger,
Stop Dosing
Fig. 1.1 Block diagram
The analog measuring element signal is amplified, fil
tered, and digitized in the A/D converter. This measure
ment signal is conditioned (filtering, analysis) in the
microprocessor, and transmitted via the interface.
Depending on the configuration, the inputs and outputs
can both control the processing and trigger valves, for
example, subject to the signal. All the parameters can be
stored power failsafe.
The digital load cells have switchable inputs or outputs:
They can use a maximum of 2 inputs or 2 outputs, or one
input and one output.
Detailed information on setting the different functions can
be found in the online help of the PanelX program.
PW15iA A4359-1.0 HBM: public 11
Structure and mode of operation
3.2 Signal conditioning
RUN
BRK
FMD
ASF ICR
A
D
Data
Filter Tare
rate
Dosing control
Fig. 1.2 Signal conditioning
Digitization is followed by filtering, using digital filters
adjusted by the software. The ICR command changes
the output rate (measured values per second).
SZA
SFA
Working
standard
calibr.
NOV, RSN
LDW, LWT LIC
User-defined
scaling
Coarse Flow
Fine Flow
Ready
Alarm
Linearization
TAV, TAS
Min/
Max
Trigger
Limit
values
PVA
IMD
LIV
Gross
measured
value
Net
measured
value
Extreme
values
Trigger/
Stop
Limit
values
In the working standard calibration of the electronics (on
delivery), 0 mV/V corresponds to zero and the maximum
capacity is either 1,000,000digits (NOV≠0), or
5,120,000digits (NOV=0). The two parameters LDW and
LWT give you the opportunity to adapt the characteristic
curve to meet your requirements (scale curve) and you
can use the NOV command to standardize the measured
values to the required scaling value (e.g. 3000d).
Detailed information can be found in the command docu
mentation and in the online help for the PanelX program.
You also have the opportunity to
S switch from gross to net signals,
12 A4359-1.0 HBM: public PW15iA
Structure and mode of operation
S activate an automatic zero on start up function,
S activate an automatic zero tracking function,
S linearize the scale curve with a third order polynomial,
S activate various digital filters. Available filters include
those with cut-off frequencies below 1Hz, fast-settling
filters for dynamic measurements, notch filters and
mean value filters.
Use MSV? to read out the current measured value. The
format of the measured value (ASCII or binary) is set
with the COF command. You can also use the COF com
mand to activate automatic measurement output. The
measured values are transmitted in the following format,
subject to the COF command:
Output format Input signal Output when NOV=0 Output when
Binary, 2 chars. (INT) 0 … maximum
capacity
Binary, 4 chars. (LONG) 0 … maximum
capacity
ASCII 0 … maximum
capacity
0 … 20,000digits 1 … NOV
0 … 5,120,000digits 1 … NOV
0 … 1,000,000digits 1 … NOV
NOV>0
3.3 Adaptive interference suppression
Whatever the mode of operation, you can use the ADF
command to activate automatic interference suppression
with adaptive filters. Interference frequencies are auto
matically found during measurement and suppressed by
comb filters and averaging. The maximum filter settling
time can be limited with the TMA command.
PW15iA A4359-1.0 HBM: public 13
Structure and mode of operation
3.4 Inputs and outputs
The two I/Os can be used either as inputs or outputs.
You can also set different switching levels (TTL or PLC)
for the inputs. On delivery, both I/Os are set as inputs
with a TTL level. Specify the function of the I/Os as
inputs with commands IM1 and IM2, and the function as
outputs with OM1 and OM2.
Notice
The electronics must be operated with a supply voltage
of between 12 and 30V. Incorrect connections between
the supply and interface cables or the digital inputs/out
puts can cause irreversible damage.
So you must check the correct assignment of the con
nections before switching on for the first time.
3.4.1 Trigger function
In Trigger mode (command IMD1), the electronics have
four different trigger functions available:
S Pre-triggering by level
S Pre-triggering by external (digital) signal
S Post-triggering by level
S Post-triggering by external (digital) signal
Gross or net values can be used as input values. The
filter settling time can be optimized by the actual elec
tronics (command AST).
14 A4359-1.0 HBM: public PW15iA
Structure and mode of operation
3.4.2 Filling and dosing
The electronics include full dosing control (command
IMD2). As many as 32 parameter sets can be stored in
the EEPROM for different applications. But you can still
change the dosing parameters yourself during dosing.
Digital outputs can be used to control coarse and fine
flow, for example. The PanelX software includes detailed
instructions for setting the different parameters.
3.4.3 Limit value function
In Standard and Trigger modes (command IMD), the
electronics allow as many as four limit values to be moni
tored (command LIV). Gross or net values, the trigger
result, or the extreme values (Min/Max) are available to
you as input signals. Use the measurement status to
read out the status, either simultaneously with the mea
sured values (command MSV?) or separately (command
RIO?).
3.4.4 Extreme value functions
The electronics include a peak value function (Minimum
and Maximum, command PVS), that monitors either the
gross or net values, as required. Use command PVA to
read out the values and use command CPV to reset the
peak values.
PW15iA A4359-1.0 HBM: public 15
Structure and mode of operation
4 Conditions on site
Series PW15iA transducers are hermetically encapsu
lated and are therefore very insensitive to the influence of
moisture and humidity. The transducers achieve protec
tion classes IP68 (test conditions: 100 hours under 1m
water column) and IP69K (water at high pressure, steam
cleaning), as per DIN EN60529
transducers must be protected against the lasting effects
of moisture and humidity.
Important
Note that when using a steam cleaner, the conditions
stated in EN 60529 under degree of protection IP69K
such as max. pressure, max. temperature, etc., must be
met.
4.1 Protection against corrosion
1)
. Nevertheless, the
The transducer must be protected against chemicals that
could attack the steel of the housing and base plate, or
the cable.
1)
When connector plug of the same protection class is fitted.
16 A4359-1.0 HBM: public PW15iA
Structure and mode of operation
Notice
Acids and all substances that release ions also attack
stainless steels and their seam welds.
The resultant corrosion can cause the transducer to fail.
If this is the case, you must provide appropriate means of
protection.
4.2 Deposits
Dust, dirt and other foreign matter must not be allowed to
accumulate sufficiently to divert some of the measuring
force onto the housing, thus distorting the measured
value (force shunt).
Do not use hard or pointed objects when cleaning the
gap between load application and housing, or between
mounting plate and housing.
PW15iA A4359-1.0 HBM: public 17
Structure and mode of operation
5 Mechanical installation
5.1 Important precautions during installation
S Handle the transducer with care.
S Welding currents must not be allowed to flow over the
transducer. If there is a risk that this might happen,
you must provide a suitable low-ohm connection to
electrically bypass the transducer. HBM provides the
highly flexible EEK ground cable for this purpose, for
example. It can be screwed on above and below the
transducer.
S Make sure that the transducer cannot be overloaded.
WARNING
There is a danger of the transducer breaking if it is over
loaded. This can cause danger for the operating person
nel of the system in which the transducer is installed.
Implement appropriate safety measures to avoid over
loads or to protect against the resulting dangers.
Notice
The length of the fastening screws must not exceed the
maximum thread reach of 10mm, as otherwise the trans
ducer could be damaged.
18 A4359-1.0 HBM: public PW15iA
Structure and mode of operation
Notice
The transducers are precision measuring elements, and
need to be handled carefully. Dropping or knocking the
transducer may cause permanent damage. Make sure
that the transducer cannot be overloaded, including while
it is being mounted.
5.2 Mounting and load application
Before installing several digital load cells into an installa
tion with a bus system, take the following into account:
S The printed production number (type plate) is required
for setting up data communication. If the type plate
can no longer be seen after installation, the numbers
of each transducer should be noted beforehand. This
enables different addresses to be assigned during
initial operation.
S Alternatively, before connection to the bus system,
you can connect each transducer individually with a
PC, in order to set different addresses (see ADR
command in online help).
Mount the transducer on a clean surface with a flatness
better than 0.1 mm. You can integrate overload protec
tion with an M6x0.5 fine-thread screw.
To minimize off-center load errors and torques, load
should be applied in the center of the platform.
PW15iA A4359-1.0 HBM: public 19
Structure and mode of operation
Connection to load application
Platform
(not included in the scope of supply)
Loading direction
Platform center
Load application
(customer construction)
Connection to the mounting plate
(not included in the scope of supply)
Mounting plate
Fig. 3.1 Mounting
Secure the load cell in the mounting holes. A platform for
load application can be mounted on top. The screws and
tightening torques to be used are given in the table
below:
Mounting Thread Min. property
class
On mounting plate M6 10.9 10N @ m 10mm
On load application M6 10.9 10N @ m 10mm
Tightening
torque
Max. thread reach
Important
The unevenness of the surface at the connecting faces
must be no worse than 0.1mm.
20 A4359-1.0 HBM: public PW15iA
5.3 Dimensions
Structure and mode of operation
25
= =
19.1±0.2
26.2
M14
12
10
19
6
Fig. 3.2 Dimensions
M6 (2x)
150
M6 (6x)
M6x0.5
(1x)
15
12
12
6
19±0.2
= =
40
20
12.5
PW15iA A4359-1.0 HBM: public 21
Structure and mode of operation
6 Electrical connection
Notice
Electronic components are sensitive to electrostatic dis
charge (ESD). So you must discharge your own static
electricity before touching the connector plugs.
6.1 Cable laying
Position the connection cable so that any condensation
or moisture that may occur at the cable can drip off
(loop). It must not be allowed to reach the transducer.
Also make sure that it is not possible for humidity or
moisture to get into the cables through open ends, thus
preventing damage to the cable sheath.
6.2 Pin assignment
Notice
The electronics must be operated with a supply voltage
of between 12 and 30V. Incorrect connections between
the supply and interface cables or the digital inputs/out
puts can cause irreversible damage.
So you must check the correct assignment of the con
nections before switching on for the first time.
The digital load cell comes supplied with an M12 8‐pin
device socket with internal thread. An M14x1 external
22 A4359-1.0 HBM: public PW15iA
Structure and mode of operation
thread for connecting HBM cables 1-173-3-1 or 1-173-6-1
is also available. These cables also have protection class
IP69K.
3
2
8
4
5
1
Fig. 4.1 Connector plug with M12 internal thread, the M14
external thread is not shown here
Pin RS-485 CANopen DeviceNet Color code for con
1 GND GND GND White
2 I/O 2 I/O 2 I/O 2 Brown
3 RA CAN High IN CAN High IN Green
4 I/O 1 I/O 1 I/O 1 Yellow
5 RB CAN Low IN CAN Low IN Gray
6 TB CAN Low OUT CAN Low OUT Pink/black
7 TA CAN High OUT CAN High OUT Blue
8 12 … 30V 12 … 30V 12 … 30V Red
6
7
nection cable
Suitable connection cables can be found in the HBM data
sheet "Cables with a plug", B3644.
Please note:
S The housing of the PW15iA is connected to the cable
shield by the connector socket. To obtain an EMCcompliant connection (EMC = electromagnetic com
patibility), the shield of this cable must be connected
to the housing of the connected device or to ground
PW15iA A4359-1.0 HBM: public 23
Structure and mode of operation
potential. A direct, low-ohm contact must be made
with the shield, via EMC-compliant PG cable glands,
for example.
S Should it be necessary, a separate cable can be used
to establish potential equalization between the digital
load cell and the (PC/PLC) master (grounding con
cept). You must not use the cable shield for this
potential equalization.
S Use shielded, low-capacitance cables only for all con
nections (interface, power supply and additional
devices) - (HBM measurement cables meet these
requirements).
S Electrical and magnetic fields often induce interfer
ence voltages in the measurement electronics. Do not
route the measurement cables parallel to power lines
and control circuits. If this is not possible, protect the
measurement cable (with steel conduits, for example).
Avoid stray fields from transformers, motors and con
tact switches.
6.3 Supply voltage
Regulated DC voltage of +12 … +30V is required to
operate the electronics and serial communication.
Voltage source requirements
S The supply voltage must be sufficiently smoothed
(RMS value minus residual ripple > 12 V).
S The electronics have a low-loss controller with a
power consumption of 3 W during operation. The cur
rent consumption is therefore dependent on the level
of the supply voltage:
24 A4359-1.0 HBM: public PW15iA
Structure and mode of operation
Power demand in A
S When switched on, the electronics briefly consume a
current of approx. 0.15 A. To ensure a safe start-up,
the power supply must be able to provide this current
without a limit being triggered. This is particularly
important when supplying several PADs from one
power supply. In contrast, the sustained loading is
calculated from the formula shown above.
S Connection to a wide-ranging supply network is not
permitted as this often causes interfering voltage
peaks to be induced. Instead, a local supply must be
provided for the electronics (even when grouped).
S The supply voltage must be insulated from the shield
potential. A connection from GND to the housing is
not required, but the max. potential difference must be
no more than 7 V.
S The supply voltage ground wire (GND) is also used as
the reference potential for the interface signals and
the digital inputs/outputs.
S In layouts with several digital load cells, the supply
can run together with the RS-485 bus lines in a 6-pin
cable (with HBM junction boxes, for example). Ensure
that there is sufficient wire cross-section provided, as
some cable sections will conduct the supply current
for all the connected electronics.
=
3 W
Voltage in V
6.4 Digital inputs
You can select the switching threshold for the digital
inputs with the SPL command. Note the different levels
for High and Low, according to the setting.
PW15iA A4359-1.0 HBM: public 25
Structure and mode of operation
SPL0 (default setting) SPL1 (PLC level) Explanation
>4V >10V High level
<1V <6V Low level
GND GND Reference potential
70kΩ 9kΩ Input resistance
6.5 Digital outputs
The following applies for the digital outputs:
Supply voltage +12 ... +30 V
Max. current per output <0.5A
Max. current for all outputs <1A
26 A4359-1.0 HBM: public PW15iA
7 Interfaces
Interfaces
The ground reference for all the interface signals is
based on the supply voltage ground (GND). GND (0V) of
the excitation voltage must therefore also be connected,
but you must not connect GND to the shield. Use a sepa
rate line to connect the node digital ground to the power
supply GND (0V).
Use a shielded cable as the interface cable. The shield
should always be connected to the housing at both ends.
Important
Before installing several digital load cells into an installa
tion with a bus system, take the following into account:
The printed production number (type plate) is required for
setting up data communication. If the type plate can no
longer be seen after installation, the numbers of each
digital load cell should be noted beforehand. This enables
different addresses to be assigned during initial opera
tion.
Alternatively, before connection to the bus system, you
can connect each digital load cell individually with a PC,
in order to set different addresses (see ADR command in
the online help).
7.1 RS‐485 4‐wire interfaces (UART)
The PW15iA comes supplied with an RS-485 interface.
Bit rates of 1200 to 115,200 baud can be set for the inter
face.
Either a single digital load cell can be connected via the
RS485 interface, or you can set up a bus system to con
PW15iA A4359-1.0 HBM: public 27
Interfaces
nect as many as 90 digital load cells to an RS-485 inter
face. All the load cells are connected in parallel on a line,
the total length of the line can be as much as 500m. The
software uses the different addresses to differentiate
between the load cells. If the control computer only has
an RS-232 interface, an interface converter is required
(e.g. from HBM, ordering no.: 1-SC232/422B).
Bus termination
+5 V
500 Ω
500 Ω
+5 V
500 Ω
500 Ω
TB TA
T
TxD
PC = Master Node 1 Node 90
Bus termination
500 Ω
500 Ω
500 Ω
500 Ω
RB RA
R
RxD
RB RA
R
on/off
TB
TA
RB
RA
RxD
TB TA
T
on/off
TxD
RB RA
R
RxD
...
TB TA
T
on/off
TxD
Fig. 5.1 Connecting several nodes to a PC via an RS‐485
4‐wire bus
The correct assignment of the transmit and receive lines
can be seen in Fig. 5.1 (bus line Ra to Ta of the con
verter, etc.). The PW15iA already includes bus termina
tion resistors (line termination), that can be activated with
the software command STR. So no additional bus termi
nation resistors are required for RS-485.
+5 V
+5 V
28 A4359-1.0 HBM: public PW15iA
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