Lika SMAX-MB Series User manual

User's guide
SMAX
Versione RS-485
•Magnetic absolute linear encoder
•Measuring length up to 600 / 23.622”
•Progra able resolution fro 1.25 down to 0.1
•MODBUS RTU (RS-485) interface
•Up to IP69K protection rate
Suitable for the following odels:
•SMAX-MB-...
Table of Contents
Safety su ary 12
Identification 14
Mechanical installation 15
Electrical connections 19
Quick reference 25
Modbus® interface 44
Progra ing para eters 59
Progra ing exa ples 77
Lika Electronic • Tel. [phone] • [email protected] • www.lika.biz
S art encoders & actuators

This publication was produced by Lika Electronic s.r.l. 2019. All rights reserved. Tutti i diritti riservati. Alle Rechte vorbehalten. Todos los
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This document and information contained herein are the property of Lika Electronic s.r.l. and shall not be reproduced in whole or in
part without prior written approval of Lika Electronic s.r.l. Translation, reproduction and total or partial modification (photostat copies,
film and microfilm included and any other means) are forbidden without written authorisation of Lika Electronic s.r.l.
The information herein is subject to change without notice and should not be construed as a commitment by Lika Electronic s.r.l. Lika
Electronic s.r.l. reserves the right to make all modifications at any moments and without forewarning.
This manual is periodically reviewed and revised. As required we suggest checking if a new or updated edition of this document is
available at Lika Electronic s.r.l.'s website. Lika Electronic s.r.l. assumes no responsibility for any errors or omissions in this document.
Critical evaluation of this manual by the user is welcomed. Your comments assist us in preparation of future documentation, in order
to make it as clear and complete as possible. Please send an e-mail to the following address [email protected] for submitting your
comments, suggestions and criticisms.

General contents
User's guide......................................................................................................................................................... 1
General contents............................................................................................................................................. 3
Subject Index................................................................................................................................................... 6
Typographic and iconographic conventions..............................................................................................7
Preli inary infor ation................................................................................................................................ 8
Glossary of MODBUS ter s.......................................................................................................................... 9
1 Safety su ary.................................................................................................................................. 12
1.1 Safety..........................................................................................................................................................................12
1.2 Electrical safety......................................................................................................................................................12
1.3 Mechanical safety..................................................................................................................................................13
2 Identification....................................................................................................................................... 14
3 Mechanical installation..................................................................................................................... 15
3.1 Overall dimensions................................................................................................................................................15
3.2 Magnetic tape.........................................................................................................................................................15
3.3 Mounting the sensor............................................................................................................................................16
3.4 Measuring length..................................................................................................................................................18
3.5 Standard counting direction.............................................................................................................................18
4 Electrical connections........................................................................................................................ 19
4.1 Connection scheme..............................................................................................................................................19
4.1.1 M8 cable specifications...............................................................................................................................19
4.1.2 M12 8-pin connector..................................................................................................................................20
4.2 Ground connection...............................................................................................................................................20
4.3 Node address...........................................................................................................................................................21
4.4 Data transmission rate: baud rate and parity bit.....................................................................................21
4.5 Bus termination resistor.....................................................................................................................................21
4.6 Diagnostic LED (Figure 3)...................................................................................................................................22
5 Quick reference................................................................................................................................... 25
5.1 Getting started.......................................................................................................................................................25
5.2 Configuring the encoder using the software tool by Lika Electronic.............................................25
5.3 Main page of the interface................................................................................................................................27
5.3.1 Configuring the serial port – Connection to the encoder...........................................................28
Read para s.......................................................................................................................................................30
Write Holding....................................................................................................................................................31
5.3.2 Reading the Input Registers.....................................................................................................................31
Continuous reading.......................................................................................................................................32
Current position...............................................................................................................................................32
Speed......................................................................................................................................................................32
SW version...........................................................................................................................................................32
HW version..........................................................................................................................................................32
Status word.........................................................................................................................................................33
Alar register....................................................................................................................................................33
Machine data not valid................................................................................................................................33
5.3.3 Reading the exception responses – Exception error......................................................................33
Exception error.................................................................................................................................................33
5.3.4 Reading / writing the Holding Registers.............................................................................................34

Total resolution................................................................................................................................................35
Preset value........................................................................................................................................................35
Offset value........................................................................................................................................................35
Node address.....................................................................................................................................................35
Baud rate..............................................................................................................................................................35
Operating para eters...................................................................................................................................36
Enable scaling function.............................................................................................................................36
Change counting dir....................................................................................................................................36
Control word......................................................................................................................................................36
Enable watchdog..........................................................................................................................................36
Execute preset................................................................................................................................................37
Upload defaults.............................................................................................................................................37
Auto save..............................................................................................................................................................37
Save para eters...............................................................................................................................................38
5.4 Update FW page - Firmware upgrade...........................................................................................................39
5.4.1 Information on firmware upgrade.........................................................................................................39
5.4.2 Preliminary operations and connections.............................................................................................40
5.4.3 Launching the firmware upgrade process..........................................................................................40
5.5 Manual frame page – Transmitting PDUs manually...............................................................................42
6 Modbus® interface............................................................................................................................. 44
6.1 Modbus Master / Slaves protocol principle................................................................................................44
6.2 Modbus frame description.................................................................................................................................45
6.3 Transmission modes..............................................................................................................................................46
6.3.1 RTU transmission mode..............................................................................................................................47
6.4 Function codes........................................................................................................................................................49
6.4.1 Implemented function codes...................................................................................................................49
03 Read Holding Registers......................................................................................................................49
04 Read Input Register.............................................................................................................................51
06 Write Single Register..........................................................................................................................53
16 Write Multiple Registers...................................................................................................................55
7 Progra ing para eters................................................................................................................. 59
7.1 Parameters available.............................................................................................................................................59
7.1.1 Machine data parameters (Holding registers)...................................................................................59
Resolution [0000 hex]...................................................................................................................................59
Preset value [0001 hex]................................................................................................................................61
Offset value [0002 hex]................................................................................................................................63
Operating para eters [0003 hex]..........................................................................................................63
Scaling function...............................................................................................................................................64
Code sequence..................................................................................................................................................64
Node address [0004 hex].............................................................................................................................65
Serial co baud rate [0005 hex].............................................................................................................65
Control Word [000A hex].............................................................................................................................66
Watchdog enable............................................................................................................................................66
Save para eters...............................................................................................................................................67
Load default para eters.............................................................................................................................67
Perfor counting preset.............................................................................................................................67
7.1.2 Input Register parameters.........................................................................................................................69
Alar s register [0000 hex].........................................................................................................................69
Machine data not valid................................................................................................................................69
Flash e ory error........................................................................................................................................69

Hall sensors error............................................................................................................................................69
Mounting error.................................................................................................................................................69
Watchdog.............................................................................................................................................................70
Current position [0001 hex].......................................................................................................................70
Current velocity [0002 hex]........................................................................................................................70
Wrong para eters list [0003 hex].........................................................................................................71
SW Version [0004 hex]..................................................................................................................................71
HW Version [0005 hex].................................................................................................................................72
Status word [0006 hex]................................................................................................................................72
Scaling...................................................................................................................................................................72
Counting direction..........................................................................................................................................72
Alar ......................................................................................................................................................................73
7.2 Exception response and exception codes....................................................................................................74
8 Progra ing exa ples..................................................................................................................... 77
8.1 Using the 03 Read Holding Registers function code.............................................................................77
8.2 Using the 04 Read Input Register function code....................................................................................78
8.3 Using the 06 Write Single Register function code.................................................................................79
8.4 Using the 16 Write Multiple Registers function code...........................................................................80
9 Default para eters list...................................................................................................................... 81
9.1 List of the Holding Registers with default value......................................................................................81
9.2 List of the Input Registers..................................................................................................................................81

Subject Index
A
Alarm.....................................................................................73
Alarm register....................................................................33
Alarms register [0000 hex]...........................................69
Auto save.............................................................................37
B
Baud rate.............................................................................35
C
Change counting dir.......................................................36
Code sequence..................................................................64
Continuous reading.........................................................32
Control word......................................................................36
Control Word [000A hex]..............................................66
Counting direction..........................................................72
Current position................................................................32
Current position [0001 hex].........................................70
Current velocity [0002 hex].........................................70
E
Enable scaling function.................................................36
Enable watchdog..............................................................36
Exception error..................................................................33
Execute preset...................................................................37
F
Flash memory error.........................................................69
H
Hall sensors error..............................................................69
HW version..........................................................................32
HW Version [0005 hex]..................................................72
L
Load default parameters...............................................67
M
Machine data not valid..........................................33, 69
Mounting error.................................................................69
N
Node address......................................................................35
Node address [0004 hex]..............................................65
O
Offset value........................................................................35
Offset value [0002 hex].................................................63
Operating parameters....................................................36
Operating parameters [0003 hex].............................63
P
Perform counting preset...............................................67
Preset value........................................................................35
Preset value [0001 hex].................................................61
R
Read params.......................................................................30
Resolution [0000 hex]....................................................59
S
Save parameters........................................................38, 67
Scaling..................................................................................72
Scaling function...............................................................64
Serial com baud rate [0005 hex]...............................65
Speed.....................................................................................32
Status word........................................................................33
Status word [0006 hex].................................................72
SW version..........................................................................32
SW Version [0004 hex]...................................................71
T
Total resolution.................................................................35
U
Upload defaults.................................................................37
W
Watchdog............................................................................70
Watchdog enable.............................................................66
Write Holding.....................................................................31
Wrong parameters list [0003 hex].............................71

Typographic and iconographic conventions
In this guide, to make it easier to understand and read the text the following typographic and
iconographic conventions are used:
•parameters and objects both of Lika device and interface are coloured in GREEN;
•alarms are coloured in RED;
•states are coloured in FUCSIA.
When scrolling through the text some icons can be found on the side of the page: they are expressly
designed to highlight the parts of the text which are of great interest and significance for the user.
Sometimes they are used to warn against dangers or potential sources of danger arising from the use of
the device. You are advised to follow strictly the instructions given in this guide in order to guarantee the
safety of the user and ensure the performance of the device. In this guide the following symbols are
used:
This icon, followed by the word WARNING, is meant to highlight the parts of the
text where information of great significance for the user can be found: user must
pay the greatest attention to them! Instructions must be followed strictly in order
to guarantee the safety of the user and a correct use of the device. Failure to heed
a warning or comply with instructions could lead to personal injury and/or damage
to the unit or other equipment.
This icon, followed by the word NOTE, is meant to highlight the parts of the text
where important notes needful for a correct and reliable use of the device can be
found. User must pay attention to them! Failure to comply with instructions could
cause the equipment to be set wrongly: hence a faulty and improper working of
the device could be the consequence.
This icon is meant to highlight the parts of the text where suggestions useful for
making it easier to set the device and optimize performance and reliability can be
found. Sometimes this symbol is followed by the word EXAMPLE when instructions
for setting parameters are accompanied by examples to clarify the explanation.

Preli inary infor ation
This guide is designed to provide the most complete information the operator needs to correctly and
safely install and operate the SMAX absolute linear encoder fitted with MODBUS RTU interface.
This sensor is designed to measure linear displacements in industrial machines and automation systems.
The measurement system includes a magnetic scale and a magnetic sensor with conversion electronics.
The scale is magnetized with a coded sequence of North-South poles generating a pseudo-random
absolute pattern. As the sensor is moved along the magnetic scale, it detects the displacement and yields
the absolute position information through the Modbus interface.
SMAX is also available with SSI interface (SMAX-BG..., SMAX-GG...) or voltage (SMAX-AV2...) / current
(SMAX-AI1...) analogue interface. SSI / analogue interface encoders are provided with their own technical
documentation.
It is mandatory to pair the sensor with the MTAX type agnetic scale. The measuring length can be
200 mm / 7.874”, 300 mm / 11.811” and 600 mm / 23.622”, see the order code.
To make it easier to read the text, this guide can be divided into two main sections.
In the first section general information concerning the safety, the mechanical installation and the
electrical connection as well as tips for setting up and running properly and efficiently the unit are
provided.
While in the second section, entitled MODBUS Interface, both general and specific information is given
on the Modbus interface. In this section the interface features and the registers implemented in the unit
are fully described.
In the “Quick reference” section on page 25 the software tool designed by Lika Electronic to easily
configure the encoder via RS-485 serial port is fully described.

Glossary of MODBUS ter s
MODBUS, like many other networking systems, has a set of unique terminology. Table below contains a
few of the technical terms used in this guide to describe the MODBUS interface. They are listed in
alphabetical order.
Address field It contains the Slave address.
Application Process The Application Process is the task on the Application Layer.
Application protocol MODBUS is an application protocol or messaging structure
that defines rules for organizing and interpreting data
independent of the data transmission medium.
ASCII trans ission ode When devices are setup to communicate on a MODBUS serial
line using ASCII (American Standard Code for Information
Interchange) mode, each 8–bit byte in a message is sent as
two ASCII characters. This mode is used when the physical
communication link or the capabilities of the device does not
allow the conformance with RTU mode requirements
regarding timers management.
Bus A bus is a communication medium connecting several nodes.
Data can be transferred via serial or parallel circuits, that is, via
electrical conductors or fibre optic.
Client A Client is any network device that sends data requests to
servers.
MODBUS follows the Client/Server model. MODBUS Masters
are referred to as Clients, while MODBUS Slaves are Servers.
Cyclic Redundancy Check
(CRC)
Error-checking technique in which the frame recipient
calculates a remainder by dividing frame contents by a prime
binary divisor and compares the calculated remainder to a
value stored in the frame by the sending node.
Data encoding MODBUS uses a ‘big-Endian’ representation for addresses and
data items. This means that when a numerical quantity larger
than a single byte is transmitted, the most significant byte is
sent first.
Exception code Code to be returned by Slaves in the event of problems. All
exceptions are signalled by adding 0x80 to the function code
of the request.
Exception response MODBUS operates according to the common client/server
(Master/Slave) model: the Client (Master) sends a request
telegram (service request) to the Server (Slave), and the Server
replies with a response telegram. If the Server cannot process
a request, it will instead return a error function code
(exception response) that is the original function code plus
80H (i.e. with its most significant bit set to 1).
Function code MODBUS is a request/reply protocol and offers services

specified by function codes. The function code is sent from a
Client to the Server and indicates which kind of action the
Server must perform. MODBUS function codes are elements of
MODBUS request/reply PDUs.
The function code field of a MODBUS data unit is coded in one
byte. Valid codes are in the range of 1 ... 255 decimal (the
range 128 – 255 is reserved and used for exception responses).
Function code "0" is not valid. Lika devices only implement
public function codes.
Holding register In the MODBUS data model, a Holding register is the output
data. A Holding register has a 16-bit quantity, is alterable by
an application program, and allows either read-write or read-
only access.
IEEE 1588 This standard defines a protocol enabling synchronisation of
clocks in distributed networked devices (e.g. connected via
Ethernet).
Input register In the MODBUS data model, an Input register is the input
data. An Input register has a 16-bit quantity, is provided by an
I/O system, and allows read-only access.
LRC Checking In ASCII mode, messages include an error–checking field that
is based on a Longitudinal Redundancy Checking (LRC)
calculation that is performed on the message contents,
exclusive of the beginning ‘colon’ and terminating CRLF pair
characters. It is applied regardless of any parity checking
method used for the individual characters of the message.
Master A Master is any network device that sends data requests to
Slaves.
Message The MODBUS messaging service provides a Client/Server
communication between devices connected on the network.
The Client / Server model is based on four types of messages:
•MODBUS Request
•MODBUS Confirmation
•MODBUS Indication
•MODBUS Response
The MODBUS messaging services are used for information
exchange.
MODBUS Confir ation A MODBUS Confirmation is the Response Message received on
the Client side.
MODBUS Indication A MODBUS Indication is the Request message received on the
Server side.
MODBUS Request A MODBUS Request is the message sent on the network by the
Client to initiate a transaction.
MODBUS Response A MODBUS Response is the Response message sent by the
Server.
Network Network is a group of computers on a single physical network
segment.

PDU The Protocol Data Unit (PDU) is the MODBUS function code
and data field. It is packed together with the Address Field and
the CRC (or LRC) to form the Modbus Serial Line PDU.
The MODBUS protocol defines three PDUs. They are:
•MODBUS Request PDU, mb_req_pdu
•MODBUS Response PDU, mb_rsp_pdu
•MODBUS Exception Response PDU,
mb_excep_rsp_pdu
Read Holding Registers
(03, 0003hex)
This function code is used to READ the contents of a
contiguous block of holding registers in a remote device; in
other words, it allows to read the values set ina group of work
parameters placed in order.
Read Input Register (04,
0004hex)
This function code is used to READ from 1 to 125 contiguous
input registers in a remote device; in other words, it allows to
read some result values and state / alarm messages in a
remote device.
Register MODBUS functions operate on memory registers to configure,
monitor, and control device I/O.
RTU trans ission ode Remote Terminal Unit. When devices communicate on a
MODBUS serial line using the RTU mode, each 8–bit byte in a
message contains two 4–bit hexadecimal characters. The main
advantage of this mode is that its greater character density
allows better data throughput than ASCII mode for the same
baud rate. Each message must be transmitted in a continuous
stream of characters.
Server A Server is any program that awaits data requests to be sent
to it. Servers do no initiate contacts with Clients, but only
respond to them.
MODBUS follows the Client/Server model. MODBUS Masters
are referred to as clients, while MODBUS Slaves are servers.
Service request It is the MODBUS Request, i.e. the message sent on the
network by the Client to initiate a transaction.
Slave A Slave is any program that awaits data requests to be sent to
it. Slaves do no initiate contacts with Masters, but only
respond to them.
Trans ission rate Data transfer rate (in bps).
Write Multiple Registers
(16, 0010hex)
This function code is used to WRITE a block of contiguous
registers (1 to 123 registers) in a remote device.
Write Single Register (06,
0006hex)
This function code is used to WRITE a single holding register in
a remote device.

SMAX MODBUS®
1 Safety su ary
1.1 Safety
•Always adhere to the professional safety and accident prevention
regulations applicable to your country during device installation and
operation;
•installation and maintenance operations have to be carried out by
qualified personnel only, with power supply disconnected and stationary
mechanical parts;
•device must be used only for the purpose appropriate to its design: use for
purposes other than those for which it has been designed could result in
serious personal and/or the environment damage;
•high current, voltage and moving mechanical parts can cause serious or
fatal injury;
•warning ! Do not use in explosive or flammable areas;
•failure to comply with these precautions or with specific warnings
elsewhere in this manual violates safety standards of design, manufacture,
and intended use of the equipment;
•Lika Electronic assumes no liability for the customer's failure to comply
with these requirements.
1.2 Electrical safety
•Turn OFF power supply before connecting the device;
•connect according to explanation in the ”Electrical connections” section on
page 19;
•in compliance with 2014/30/EU norm on electromagnetic
compatibility, following precautions must be taken:
- before handling and installing the equipment, discharge
electrical charge from your body and tools which may come in touch
with the device;
- power supply must be stabilized without noise; install EMC filters on
device power supply if needed;
- always use shielded cables (twisted pair cables whenever possible);
- avoid cables runs longer than necessary;
- avoid running the signal cable near high voltage power cables;
- mount the device as far as possible from any capacitive or inductive
noise source; shield the device from noise source if needed;
- to guarantee a correct working of the device, avoid using strong magnets
on or near by the unit;
MAN SMAX MB E 1.2 Safety summary 12 of 84

SMAX MODBUS®
- minimize noise by connecting the shield and/or the connector housing
and/or the sensor to ground. Make sure that ground is not affected by
noise. The connection point to ground can be situated both on the device
side and on user’s side. The best solution to minimize the interference
must be carried out by the user;
•do not stretch the cable; do not pull or carry by cable; do not use the cable
as a handle.
1.3 Mechanical safety
•Install the device following strictly the information in the “Mechanical
installation” section on page 15;
•mechanical installation has to be carried out with stationary mechanical
parts;
•do not disassemble the unit;
•do not tool the unit;
•delicate electronic equipment: handle with care; do not subject the device
and the shaft to knocks or shocks;
•protect the unit against acid solutions or chemicals that may damage it;
•respect the environmental characteristics of the product;
•we suggest installing the unit providing protection means against waste,
especially swarf as turnings, chips, or filings; should this not be possible,
please make sure that adequate cleaning measures (as for instance
brushes, scrapers, jets of compressed air, etc.) are in place in order to
prevent the sensor and the magnetic scale from jamming.
MAN SMAX MB E 1.2 Safety summary 13 of 84

SMAX MODBUS®
2 Identification
Device can be identified through the order code and the serial nu ber printed
on the label applied to its body. Information is listed in the delivery document
too. Please always quote the order code and the serial number when reaching
Lika Electronic for purchasing spare parts or needing assistance. For any
information on the technical characteristics of the product refer to the technical
catalogue.
Warning: devices having order code ending with "/Sxxx" may have
mechanical and electrical characteristics different from standard and
be supplied with additional documentation for special connections
(Technical Info).
MAN SMAX MB E 1.2 Identification 14 of 84

SMAX MODBUS®
3 Mechanical installation
WARNING
Installation and maintenance operations have to be carried out by qualified
personnel only, with power supply disconnected. Mechanical parts must be in
stop.
For any information on the mechanical data and the electrical characteristics of
the encoder please refer to the technical catalogue.
3.1 Overall di ensions
(values are expressed in mm)
3.2 Magnetic tape
The sensor has to be paired with the MTAX type agnetic scale only. For
detailed information on the MTAX type tape and how to mount it properly,
please refer to the specific technical documentation.
Install the unit providing protection means against waste, especially swarf as
turnings, chips or filings; should this not be possible, please make sure that
adequate cleaning measures (as for instance brushes, scrapers, jets of
MAN SMAX MB E 1.2 Mechanical installation 15 of 84

SMAX MODBUS®
compressed air, etc.) are in place in order to prevent the sensor and the
magnetic scale from jamming.
Make sure the mechanical installation meets the system's requirements
concerning distance, planarity and parallelism between the sensor and the scale
indicated in Figure 2 all along the whole measuring length.
MTAX magnetic scale can be provided with a cover strip to protect its magnetic
surface (see the order code).
Figure 1 shows how the sensor and the scale must be installed; the arrow
indicates the standard counting direction (increasing count when the sensor
moves in the direction indicated by the arrow; further information can be found
in the “Code sequence” section on page 64).
WARNING
The system cannot operate if mounted otherwise than illustrated in Figure 1.
3.3 Mounting the sensor
Figure 1
Make sure the mechanical installation complies with the system requirements
concerning distance, planarity and parallelism between the sensor and the scale.
Avoid contact between the parts. Sensor is fixed by means of two M4 25
in. long cylinder head screws inserted in the provided holes. Recommended
ini u bend radius of the cable: R  25 . Install the sensor and the
magnetic scale as shown in the Figure. The system does not operate if mounted
MAN SMAX MB E 1.2 Mechanical installation 16 of 84

SMAX MODBUS®
otherwise than illustrated in the Figure. The arrow is intended to indicate the
standard counting direction (count up information).
Please note that the MTAX magnetic scale can be provided with a cover strip to
protect its magnetic surface (see the order code). Therefore the distance
between the sensor and the magnetic scale is different whether the cover strip
is applied.
The distance D (see Figure 2) between the centre of the screw fixing holes
and the MTAX agnetic scale has to be as follows:
without cover strip with cover strip
31.7 mm  33.2 mm (1.248”  1.307”) 31.3 mm  32.8 mm (1.232”  1.291”)
For better operation the suggested distance D is 32.2 (1.267”).
WARNING
Make sure the mechanical installation complies with the system requirements
concerning distance, planarity and parallelism between the sensor and the scale
as shown in Figure 2 all along the whole measuring length.
MAN SMAX MB E 1.2 Mechanical installation 17 of 84

SMAX MODBUS®
Figure 2
WARNING
After having installed the sensor on the magnetic scale a zero setting operation
is compulsorily required. The zero setting operation is further required every
time either the sensor or the scale is replaced. For any information on the zero
setting operation please refer to the “Perform counting preset” section on page
67.
3.4 Measuring length
The axi u length of the tape L is between 280 mm / 11.023” and 680 mm
/ 26.771” (for further information refer the order code in the product datasheet).
As the sensor area has always to be fully within the limits of the tape magnetic
surface, then the axi u easuring length ML is the maximum length of
the tape minus the length of the sensor head = L – 80 mm / 3.149” (200 mm /
7.874” ÷ 600 mm / 23.622”).
3.5 Standard counting direction
The positive counting direction (count up information) is achieved when the
sensor moves on the tape according to the white arrow shown in Figure 1. For
further information see the “Code sequence” section on page 64.
MAN SMAX MB E 1.2 Mechanical installation 18 of 84

SMAX MODBUS®
4 Electrical connections
WARNING
Power supply must be turned off before performing any electrical connection!
For any information on the mechanical data and the electrical characteristics of
the encoder please refer to the technical catalogue.
4.1 Connection sche e
WARNING
If wires of unused signals come in contact, irreparable damage could be caused
to the device. Please insulate them singularly.
Function M8 cable M12 8-pin
0Vdc power supply 1Black 1
+10Vdc +30Vdc power supply Red 2
A_RS485 IN Yellow 3
B_RS485 IN Blue 4
A_RS485 OUT 2Green 5
B_RS485 OUT 2Orange 6
n.c. White 7
n.c. Grey 8
Shield Shield Case
1 OVdc of the RS-485 serial line too.
2 In order to minimize cable reflections and ensure a defined noise level on the data
lines a 120 Ωtermination resistor must be provided between A_RS485 OUT and
B_RS485 OUT if the encoder is the last slave in the line. For any information refer to the
“4.5 Bus termination resistor” section on page 21.
4.1.1 M8 cable specifications
Model : LIKA HI-FLEX sensor cable type M8
Wires : 2 x 0.22 mm2 + 6 x 0.14 mm2 (24/26 AWG)
Jacket : Matt Polyurethane (TPU) halogen free, oil, hydrolysis,
abrasion resistant
Shield : tinned copper braid, coverage  85%
Outer diameter : 5.3 mm ÷ 5.6 mm (0.209” ÷ 0.220”)
MAN SMAX MB E 1.2 Electrical connections 19 of 84

SMAX MODBUS®
Min. bend radius : Ø x 7.5
Work temperature : -40°C +90°C (-40°F +194°F) – dynamic installation
-50°C +90°C (-58°F +194°F) – fixed installation
Conductor resistance :  90 /km /  148 /km
4.1.2 M12 8-pin connector
Male, frontal side
A coding
4.2 Ground connection
To minimize noise connect properly the shield and/or the connector housing
and/or the frame to ground. Connect properly the cable shield to ground on
user's side. Lika's EC- pre-assembled cables are fitted with shield connection to
the connector ring nut in order to allow grounding through the body of the
device. Lika's E- connectors have a plastic gland, thus grounding is not possible.
If metal connectors are used, connect the cable shield properly as recommended
by the manufacturer. Anyway make sure that ground is not affected by noise. It
is recommended to provide the ground connection as close as possible to the
device.
MAN SMAX MB E 1.2 Electrical connections 20 of 84