Seneca Z-LINK2-LO User manual

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USER MANUAL
Z-LINK2-LO
Modbus Gateway – Remote IO radio and repeater
with Lora technology

USER MANUAL - Z-LINK2-LO
2
Date
Revision
Note
Author
Code
11/04/2023
1
First edition
MM
MI00610-1
11/04/2023
1
Translated into
English
MM
MI00610-2

USER MANUAL - Z-LINK2-LO
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Contents
SENECA..............................................................................................................................4
Z-LINK2-LO.........................................................................................................................4
1. INTRODUZIONE...........................................................................................................5
1.1. FUNZIONE REPEATER (RIPETITORE) ...................................................................8
1.2. NUMERO MASSIMO DI Z-LINK2-LO........................................................................8
2. Z-LINK2-LO MODALITÀ BRIDGE................................................................................8
IMPOSTAZIONE DI Z-LINK2-LO COME MODALITÀ “BRIDGE” ....................................11
3. Z-LINK2-LO "MODALITÀ I/O REMOTO"...................................................................14
3.1. IMPOSTAZIONE DI Z-LINK2-LO COME "MODALITÀ I/O REMOTO"...................16
3.1.1. IMPOSTAZIONE DELLO Z-LINK2-LO COME "REMOTE I/O MASTER
MODBUS". ........................................................................................................................17
3.1.2. IMPOSTAZIONE DELLO Z-LINK2-LO COME "REMOTE I/O SLAVE MODBUS".
26
4. PROTOCOLLO MODBUS RTU..................................................................................28
5. AGGIORNAMENTO DEL FIRMWARE.......................................................................29
6. DIAGNOSTICA DEL FUNZIONAMENTO TRAMITE I LED........................................30
6.1. FUNZIONAMENTO DEI LED IN BASE ALLA MODALITA’ DI FUNZIONAMENTO
30
6.1.1. BRIDGE MASTER MODBUS / REMOTE I/O MASTER MODBUS......................30

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6.1.2. BRIDGE SLAVE MODBUS / REMOTE I/O SLAVE MODBUS ............................30
7. SOLUZIONI AI PROBLEMI ........................................................................................31
Seneca
Z-LINK2-LO
ATTENTION!
IN NO EVENT, SHALL SENECA S.R.L. OR ITS SUPPLIERS BE LIABLE FOR LOSS OF REGISTRATION
DATA/INCOME OR FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES RESULTING FROM
NEGLIGENCE OR THE IMPROPER OR IRRESPONSIBLE USE OF Z-LINK2-LO, EVEN IF SENECA IS
AWARE OF SUCH POSSIBLE DAMAGES.
SENECA, ITS SUBSIDIARIES, AFFILIATES, GROUP COMPANIES, ITS SUPPLIERS AND ITS DEALERS DO
NOT WARRANT THAT THE FUNCTIONS WILL FULLY MEET YOUR EXPECTATIONS OR THAT Z-LINK2-
LO, THE FIRMWARE AND THE SOFTWARE ARE ERROR-FREE OR WORK IN A CONTINUOUS WAY.

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1. INTRODUCTION
The Z-LINK2-LO device is designed to transparently transfer serial packets over a wireless network.
The simplified outline of Z-LINK2-LO is:
The Z-LINK2-LO USB port can only be used for programming Z-LINK2-LO from a Windows™ PC with the Easy
Setup software.
For the connection with Modbus RTU devices it is possible to use the RS232 or RS485 port.
The radio connects two or more Z-LINK2-LO devices.
Two working modes are supported: "Bridge Mode" and "Remote I/O Mode".
It is also possible to configure a device as a radio signal repeater.

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The figure shows a typical application of the Z-LINK2-LO device in "Bridge mode" within a ModBUS RTU
network:
In this mode the Modbus fieldbus is transparently connected "over the air".
Note that the Z-LINK2-LO in “Bridge” mode does not act as Modbus Master, an external Modbus Master
“M” device is always required.

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The figure shows a typical application of the Z-LINK2-LO device in "Remote I/O" mode within a ModBUS
RTU network:
The inputs are replicated on the outputs. If the inputs are digital it is possible to negate them, if they are
analogue it is possible to scale their values. A fault condition can be used for safety requirements.
Note that an external Modbus RTU Master device is not required in this mode because the Z-LINK2-LO also
acts as a Modbus RTU Master on the bus.
ATTENTION!
-ONLY THE MODBUS RTU PROTOCOL IS SUPPORTED
-ONLY ONE PORT (RS232 OR RS485) CAN BE USED AT THE SAME TIME.

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1.1. REPEATER FUNCTION
In each of the previous modes it is possible to activate the repeater function. When a Z-LINK2-LO works as a
repeater, the received radio signal is also retransmitted in order to increase the signal range.
1.2. MAXIMUM NUMBER OF Z-LINK2-LOS
There is no maximum number of Z-LINK2-LOs that can be used in a network, but Seneca recommends not
installing more than 30 Z-LINK2-LOs in a single network.
For more complex networks it is possible to use two or more parallel networks by changing the network
key.
2. Z-LINK2-LO BRIDGE MODE
Z-LINK2-LO can be used to connect two or more Modbus RTU buses wirelessly.
Examples of point-to-multipoint connections are shown in the following figures:
The simplest is the point-to-point connection: 1 Modbus master connected to 1 remote Modbus slave:
More complex, it is possible to connect 1 Modbus master with multiple Modbus slaves:

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Furthermore, it is possible to connect 1 Modbus master without local Modbus slaves (point-to-multipoint):
It is also possible to connect Modbus Slaves on the local Modbus master bus:

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If a Z-LINK2-LO is not easily accessible, it is possible to configure one as a "repeater", note that Modbus RTU
Slave devices can also be connected to the repeater:

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SETTING Z-LINK2-LO AS “BRIDGE” MODE
To configure the device, use the Easy Setup software which can be downloaded from the Seneca website in
the Z-LINK2-LO section.
ATTENTION!
Before starting any configuration operation it is necessary to TURN OFF the Master Radio device
For programming you need to:
1) Turn off the Modbus master
2) Set the dip switches on Z-LINK2-LO to programming mode and power up the device:
3) connect the USB cable to the PC
The Z-LINK2-LO connected to the Master is called "Bridge Master", while the other Z-LINK2-LOs
(connected to the slaves) are called "Bridge Slaves".
ATTENTION!

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ONLY ONE Z-LINK2-LO CAN BE CONFIGURED AS "BRIDGE MASTER", ALL OTHERS MUST BE
CONFIGURED AS "BRIDGE SLAVES".
4) Now that the local bus configuration has been completed, we need to
configure the radio:
It is possible to choose if the device is of the repeater type, the network key and if the radio packets
are encrypted.
All Z-LINK2-LOs on the same network must have the same network key. If you want to create, for
example, 3 parallel networks, you need to create 3 different network keys.
There is no maximum number of parallel networks, but to obtain acceptable performance, the
number of 8 networks must not be exceeded.
ATTENTION!
TWO Z-LINK2-LOs WITH DIFFERENT NETWORK KEYS CANNOT BE INSERTED INTO THE SAME
NETWORK BECAUSE THEY ARE NOT VISIBLE TO EACH OTHER.

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5) Once the configuration has been sent to the Z-LINK2-LO, turn off the Z-LINK2-
LO and set the dip switches:
For Z-LINK2-LO "Bridge Master":
For Z-LINK2-LO "Bridge Slave":
6) Now you can connect Modbus devices via the Rs485 or Rs232 port.
The RS485 port is available via the 7-8-9 terminal screw or via the IDC10 bus
connector.
The RS232 port is available via the 4-5-6 terminal screw.

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3. Z-LINK2-LO "REMOTE I/O MODE”
The Z-LINK2-LO can be used to copy inputs to remote outputs, for example it is possible to shift alarm
indications or retransmit an analogue measurement without connecting cables:
Using Seneca I/O Modbus RTU slave modules, the above example can be achieved with:
NR1 Seneca Z-4DI-2AI-2DO Station address 1
NR1 Z-DOUT Station 2 address
NR1 Z-3AO Station 3 address
NR2 Z-LINK2-LOs in remote I/O mode

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Digital inputs can be negated before retransmission while analogue measurements can be scaled before
retransmission.
The maximum number of digital inputs supported is 20.
The maximum number of analogue inputs/outputs supported is 50.
On the output side a fault condition can be triggered: if there is a fault on the inputs, the outputs can be
switched into a programmed safety condition.
ATTENTION!
To use the output fault condition, it is best to connect the inputs to the "Remote I/O Master" and the
outputs to the "Remote I/O Slave".

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3.1. SETTING THE Z-LINK2-LO AS "REMOTE I/O MODE”
To configure the device, use the Easy Setup software which can be downloaded from the Seneca website in
the Z-LINK2-LO section.
ATTENTION!
Before starting any configuration operation it is necessary to TURN OFF the Master Radio device
For programming you need to:
1) Turn off any Z-LINK2-LO configured as Modbus Master
2) Set the dip switches on Z-LINK2-LO to programming mode and power up the device:
3) connect the USB cable to the PC
The Z-LINK2-LO that will function as Master is called "Remote I/O Modbus Master", while the other Z-
LINK2-LOs (connected to slaves) are called "Remote I/O Modbus Slaves".
ATTENTION!
ONLY ONE Z-LINK2-LO CAN BE CONFIGURED AS "REMOTE I/O MASTER", ALL OTHERS MUST
BE CONFIGURED AS "REMOTE I/O SLAVEs".

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3.1.1. SETTING THE Z-LINK2-LO AS "REMOTE I/O MODBUS
MASTER".
1) In the Modbus serial bus configuration section, select the baud rate of the Modbus Master and the
working mode:
The Z-LINK2-LO acting as Modbus Master is called "Remote I/O Modbus Master".
ATTENTION!
ONLY ONE Z-LINK2-LO CAN BE CONFIGURED AS "MODBUS MASTER", ALL OTHERS MUST BE
CONFIGURED AS "MODBUS SLAVEs".

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2) Now that the local bus configuration has been completed, we need to configure the radio:
It is possible to choose if the device is of the repeater type, the network key and if the radio packets
are encrypted.
All Z-LINK2-LOs on the same network must have the same network key. If you want to create, for
example, 3 parallel networks, you need to create 3 different network keys.
There is no maximum number of parallel networks, but to obtain acceptable performance, the
number of 8 networks must not be exceeded.
ATTENTION!
TWO Z-LINK2-LO WITH DIFFERENT NETWORK KEYS CANNOT BE INSERTED INTO THE SAME
NETWORK BECAUSE THEY ARE NOT VISIBLE TO EACH OTHER.

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3) Now we need to configure the Modbus Master parameters:
Response Timeout is the time that the master waits to declare a communication timeout (the slave did not
respond)
Delay Between Requests is the pause between one query from the master and the next
Retries to activate Fail is the number of communication attempts before declaring a fail.

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4) Now let's configure the digital inputs that are to be retransmitted to the digital outputs:
Press "Add new" and select from the internal Seneca database the digital input that must be
retransmitted to the output: