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Modbus – is a standard and protocol for packet communication over the "client-server" technology for
industrial electronic units;
Modbus RTU – is a communication protocol of the unit for bite wise transfer of the package;
Modbus ASCII – is a communication protocol of the unit for the transfer of package in the form of ASCII-symbols;
Modbus TCP – is a protocol for transferring Modbus packages under the TCP/IP standard;
RS-485/EIA-485 – is a network standard for communicating units over the twisted pair;
SMS – a standard and technology of transmitting the brief messages via mobile communication;
TCP/IP – is a standard and a set of protocols for transferring data along the networks with delivery verification;
WEB – is a system for accessing documents on the server, used in the Internet.
WEB-page – is a document, file, recourse, which is available on the Web-server;
WEB-browser – is a WEB-server client for accessing the WEB-pages, which is primarily using the HTTP
protocol.
1.3 TECHNICAL SPECIFICATIONS
1.3.1 Main Technical Specifications
Main technical specifications are resulted in Table 1.
Table 1 – Main technical specifications of the unit
Operating supply voltage, VAC
Voltage to maintain normal operation, V
- alternating current
- direct current
Supply line frequency, Hz
Harmonical configuration (nonsinusoidality) of power supply voltage
Data Exchange Interface over the Ethernet network
Supported Ethernet protocols
Data Exchange Interface over wireless network
Supported standards of wireless network
Integrated servers
Maximum number of connections over the Modbus TCP protocol
Data Exchange Interface over the Modbus network
Supported protocols of Modbus network
Maximal output voltage of driver RS-485, V
Short circuit output voltage of driver RS-485 (maximal), mA
Resistance of inbuilt terminator, Ohm
The recommended number of connected devices in Modbus network
- at input voltage of receivers on bus RS-485 not more than 0,125 mA
- at input voltage of receivers on bus RS-485 not more than 1 mA
Readiness time at power switching on, sec, not more than
Precision measurements of voltage, mV, not more than
Precision measurements of current, A, not more than
Precision measurements of temperature, °C, not more than
Voltage supply, at which operability is maintained:
- alternative current, V
- direct current, V
Rated voltage direct current back supply , V
Back supply voltage at which operability is maintained, V
Power consumption (under pressure), W ,not more than
The maximum switched current of output contacts , A
Weight, kg, not more than
Overall dimensions, mm
- with installed antenna
- without antenna
Purpose of device
Nominal operation condition
EM-486
~ 4 ~
230
90 – 250
127 – 350
45 – 65
EN 50160:2010, IDT
10Base-T / 100Base-T
UDP, ARP, TCP
GSM
SMS, GPRS
Modbus TCP, HTTP, FTP
4
RS-485
Modbus RTU, Modbus ASCII
3,3
250
70–1 000 Ohm
or deactivated
Not more, 256
Not more, 32
15*
40
200
2
90 – 250
127 – 350
12
9 – 16
12
16
0,750
157 х 112 х 56
157 x 99 x 56
Control and distribution device
continuous
NOVATEK-ELECTRO
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