Nokeval Cell2-Sky-Link-RS485-LTE/LAN User manual

ID11200 V31 24.9.2021
Firmware versions 1.0-1.0
Cell2-Sky-Link-RS485-LTE/LAN
User Manual

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Table of contents
Introduction ....................................................................................................................................................4
Serial interface ............................................................................................................................................4
Sky radio......................................................................................................................................................4
Installation ......................................................................................................................................................5
Wall holder ..................................................................................................................................................5
Installation location....................................................................................................................................5
Connections ................................................................................................................................................6
Power supply & serial RS-485 connector ...............................................................................................6
Micro-SIM.................................................................................................................................................7
Cellular network LED...............................................................................................................................7
RS-485......................................................................................................................................................7
RS-485 bus information ..........................................................................................................................7
Backup battery case and POL connector...............................................................................................8
Configuring the device....................................................................................................................................9
Connection settings ................................................................................................................................9
Programming connector.........................................................................................................................9
Conf menu ...................................................................................................................................................9
Time settings...........................................................................................................................................9
Serial settings..........................................................................................................................................9
Network .................................................................................................................................................16
Nokeval Sky settings.............................................................................................................................17
Buzzer ....................................................................................................................................................18
Info.........................................................................................................................................................19
Mon menu..................................................................................................................................................19
Cal menu....................................................................................................................................................20
Usage.............................................................................................................................................................21
LEDs ...........................................................................................................................................................21
2G/4G .....................................................................................................................................................21
LAN.........................................................................................................................................................21
Uplink.....................................................................................................................................................21
Mem .......................................................................................................................................................21
Sky .........................................................................................................................................................22
RS485.....................................................................................................................................................22
FOTA.......................................................................................................................................................22
Batt ........................................................................................................................................................22
Power.....................................................................................................................................................22

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Multifunction button ...........................................................................................................................22
Status information....................................................................................................................................22
Maintenance..................................................................................................................................................24
Cleaning.....................................................................................................................................................24
Service .......................................................................................................................................................24
Troubleshooting............................................................................................................................................25
Specifications................................................................................................................................................26
Environment..........................................................................................................................................26
Measurements.......................................................................................................................................26
User interface ........................................................................................................................................26
Internal memory for buffered results...................................................................................................26
Backup batteries ...................................................................................................................................26
433.92 MHz radio transceiver (Sky) ......................................................................................................26
Network connection, depending on the device type...........................................................................26
Power supply.........................................................................................................................................26
Other......................................................................................................................................................27
Cloud connection..................................................................................................................................27
Warnings........................................................................................................................................................28
Open-Source Software Notice......................................................................................................................29
Trademarks ...................................................................................................................................................32
Manufacturer.................................................................................................................................................32

4
Introduction
Cell2-Sky-Link-RS485-LTE and Cell2-Sky-Link-RS485-LAN are base stations for Nokeval’s 433.92MHz
Sky-transmitters and are part of Nokeval Sky product families. They receive and buffer radio packets to
non-volatile memory and transmit them over cellular mobile data networks (LTE model) or local area
networks (LAN model) to Nokeval’s cloud data collections services, like Ovaport, thus enabling reliable
remote data acquisition from the field, straight to the cloud. The base station’s reliability is increased
by the backup batteries, which enable uninterrupted data acquisition also during external power
interruptions.
Serial interface
The base station can also be connected to standard Modbus RTU transmitters and to Nokeval
devices with SCL protocol using the integrated RS485 bus master.
Sky radio
Nokeval’s third generation Sky radio devices use the Semtech’s LoRa modulation technology on the
European license-free 433 MHz ISM band that allows unforeseen wireless range for battery powered
transmitters. The protocol used is defined by Nokeval, called Sky, which means that these devices are
not compatible with the LoRaWAN infrastructure.
The modulation has some parameters to define its operation. With the “maximal” settings, a very long
range can be reached, but at the expense of higher battery and radio band consumption. One radio
transmission can last approx. 2 seconds (compared to 20 ms of the Nokeval MTR series). This means
that the number of transmitters within the range must be limited to avoid collisions and to allow radio
time for each. It is not practical to use a short interval between transmissions; 10 to 30 minutes is the
recommended interval range.
When the maximal range is not necessary, the parameters should be adjusted for lower battery and
band consumption. All the devices within one network must share the parameters, because the
receiver can only listen with one set of parameters at a time. Consequently, the parameters must be
selected according to the most distant device. It is also possible to adjust the transmission power. The
devices that are closer to the receiver can use a lower power setting.
Before using these 433 MHz radio devices, make sure it is legal in your country.

5
Installation
Wall holder
Install the base station to a wall or some other suitable surface with the separate wall holder. See the
following dimensional drawing for the wall holder’s mounting hole distances. Use fastening accessories
suitable for the wall material, like plugs and screws. The screws need to have a countersunk head.
Installation location
Choose an installation location that is central in relation to the radio transmitters.
The base station must be installed vertically. The base station is splash waterproof, but the location
must be chosen so that the unit will not be exposed to water or hot steam. Please note that the AC
socket and the power supply are not splash waterproof.
The location must have LTE/GSM/GPRS network coverage for the LTE model. This can be verified before
the final installation steps by powering on the base station and checking the signal strength indicator
LEDs (see page 21). Installation location must have one free AC socket for the power supply.

6
Connections
Power supply & serial RS-485 connector
Inside the device, at the bottom right of the circuit board, is a four-pole spring cage / plug-in terminal
block connector. It is a combined power supply and serial data connector.
The table below describes the function of each connector pole.
Symbol
Description
+24VDC
Power supply positive connection, 18…28 VDC
GND
Power supply negative connection, RS-485 bus ground
D1
RS-485-bus D1 connection
D0
RS-485 bus D0 connection

7
Micro-SIM
Insert micro-sized SIM card with a PIN code request set to off.
Cellular network LED
•LTE Cat NB1/M1: LED lit continuously
•LTE Cat NB1/M1 roaming: LED flashes once per second
•eGPRS: LED flashes once every 2 second
•eGPRS roaming: LED flashes twice every 2 second
RS-485
RS-485 serial communication can be used to read results from external devices. The protocol can be
Modbus, Nokeval SCL or also ASCII protocol for Vaisala WXT500 series weather transmitter.
The RS-485 bus termination can be set with jumpers on the circuit board, as shown below. Extra
jumpers can be put at the places marked in gray. These do not affect the connection.
Off
AC termination
Failsafe biasing
AC termination & Failsafe biasing
This example picture illustrates how the base station can be connected to an RMD680 / RMD681
transmitter by sharing one 24 VDC power supply.
RS-485 bus information
RS-485 is a serial bus type commonly used in the industry. It is based on two data lines D0 and D1,
which are connected in parallel with all the devices connected to RS-485 bus and D0 and D1 pins. To
even up the electric potential between different devices, a third wire is also needed. In the above
example picture the blue ground wire evens the potential differences between the devices. Branches in
the bus should be avoided, in other words the bus cabling should circulate through all the devices
without branches. The maximum recommended length of the bus is 1 km. The cable should be twisted
pair and the wire diameter should be at least 0.5 mm.
To ensure EMC compliance the RS-485 bus cable should no more than 30 meters long.
The bus is bidirectional. Only one device at a time can send data, during which other devices listen.
Only one device connected to the bus is set as a master, in other words as a chairman, which starts all
conversations on the bus. Other devices are slaves and they only answer to queries of the master. Each
device connected to the bus has its unique bus address, which the master device uses to direct its
commands to a specific device.

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The base station functions as an RS-485 bus-master and queries the measurement data from other
devices on the bus. In a typical application, such as the one presented in the diagram above, the base
station regularly queries the RMD680 / RMD681 transmitter’s measurement data and sends it to the
Ovaport server.
Backup battery case and POL connector
The battery cover can be opened by removing the two screws on the cover of the device. The screws
indicated by the arrows are shown in the picture below. The device uses two D-size heavy-duty alkaline
batteries. There is also a Meku POL configuration connector inside the battery case. See "Configuring
the device" in the next section of the manual. The location of the POL connector is marked with a circle
in the figure below.

9
Configuring the device
There is usually no need to configure the device since most of the settings are already at their best
defaults. However, if you want to see what kind of settings there are or edit settings, use MekuWin
program and DCS772 (USB-POL converter). You can download MekuWin from Nokeval’s web site
www.nokeval.com for free.
Connection settings
Communication settings for configuration:
•baud rate 9600
•protocol SCL
•address 0
Programming connector
The device has a 3PIN POL programming connector under the backup battery compartment lid.
Remove the battery compartment lid to access the programming connector. Use POL-3PIN adaptor to
connect the DCS772 to the device. The 3PIN POL programming connector can be connected in both
ways.
Conf menu
Time settings
The device can forward packets only if it has a time set. It receives time information from internet, so
you do not need normally to use this manual setting.
Serial settings
The device can retrieve measurement results with the following serial communication protocols:
Modbus RTU, Nokeval SCL or Vaisala's WXT5x0 ascii protocol.
Basic settings for serial communication

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Protocol
•Modbus
•WXT5x0 Ascii
•SCL
Baud rate
300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 125000, 230400.
Bits
•8N1 (8 data bits, No Parity, 1 stop bit)
•8N2 (8 data bits, No Parity, 2 stop bit)
•8E1 (8 data bits, Even Parity, 1 stop bit)
•8O1 (8 data bits, Odd Parity, 1 stop bit)
Timeout [s]
1 –5 s
After the command, the response is expected to receive from device in the timeout period. If the
time is exceeded and no response received, an error is set.
Query interval [das]
1 –29 das
Query interval time between queries. Presented in decaseconds (das, a unit of time equal to 10
seconds). For example, value 3 = 30 seconds.
Queries
1 - 64
The number of different queries. The maximum is 64. Each device that is being queried needs at
least one query and if the same device is queried for multiple information which is not in
subsequent registers or they have different data types, multiple queries are needed.
Virtual ID offset
0
A setting that shifts (sums) the value of all virtual IDs. Practical to move virtual IDs to a different
area if there are many gateways in the same destination with similar serial communication settings.
Overview
Displays the serial communication status for each query:
•Not used (Results setting zero)
•OK
•Incorrect settings - Conf settings are incorrect
•Limited - Only part of the sequential results is fetched, because virtual ID has overlapping with
some other query or “internal status” result.
•Blocked –The result is not fetched, because virtual ID has overlapping with some other query or
“internal status” result.