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8
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EM-481
NOVATEK-ELECTRO
When connecting to the RS-485 bus, use twisted pair cable of category 1 or higher. It is recommended to use
shielded cable; in this case it should be earthed.
When connecting to Ethernet, use the cable supplied, or twisted pair cable of category 5e with 8P8C (RJ-45) lug.
Wires fastening should exclude mechanical damage, twisting and abrasion of the wire insulation.
IT IS NOT ALLOWED TO LEAVE EXPOSED PORTIONS OF WIRE PROTRUDING BEYOND THE TERMINAL
BLOCK.
For a reliable contact, tighten the terminal screws with the force indicated in Table 3.1.
When reducing the tightening torque, the junction point is heated, the terminal block may be melted and wire can
burn. If you increase the tightening torque, it is possible to have thread failure of the terminal block screws or the
compression of the connected wire.
To improve the performance of the device, it is recommended to install the fuse F1 (fuse element) or its
equivalent in the EM-481 supply circuit for a current of no more than 2.5 A.
5.1.3.
Device connection
5.1.3.1.
Connect the device as per Fig. 5.1.
5.1.3.2.
Connect the connection cable to the MODBUS network to the "RS-485" connector and to the MODBUS
network (or directly to the device with the RS-485 interface).
5.1.3.3.
If the EM-481 is to connect to the Internet through wired communication, to local network or directly to
computer, connect the Ethernet connection cable to the Ethernet connector and to the Ethernet network. The details
of connection depending on the type of wire line are indicated in Appendix B.
5.1.3.4.
Connect power to the "12 V" power connector.
5.1.3.5.
If the EM-481 is to connect to the Internet through wireless communication, put SIM card of the telecom
operator in the SIM slot, and connect the GSM antenna to the ANT connector (SMA F connector).
5.2. Using the device
5.2.1.
General
After power is turned on, all indicators except
"LAN"
and
"GSM"
light up, and EM-481 performs initialization.
After that, for 2 seconds indicators, except for the power indicator, go out, and the device proceeds to start of
communication interfaces with networks. In this case, the display shows general information about the device
(Fig. 5.2). The start can take up to 15 seconds, depending on settings and the connection quality.
Figure 5.2
– Displaying of general information about the device on the display
After this, the EM-481 goes on to setting connection with the server and querying MODBUS devices.
ATTENTION! IF "AL" LED PERMANENTLY ON OR PERIODICALLY BLINKS AFTER EM-481 ENABLING
IT MEANS THE DEVICE FAILURE.
EM-481 provides and supports the connection to Ethernet and GSM
/UMTS
networks.
If the
"LAN"
indicator lights up, the connection to the network is successful. The blinking
"LAN"
LED indicates
the data is being transmitted through the network.
If the
"GSM"
indicator blinks every three seconds, the connection to the GSM network or UMTS
is set
successfully. If the
"GSM"
indicator blinks three times per second, then the data is transmitted via GPRS
or HSPA.
The display shows the loads of I/O interfaces and GSM signal level, as shown in Fig. 5.4.
“E: 5.2k” – the transmission speed via Ethernet is 5.2 kB/s;
“2G: 7-0.3k” – the GSM signal level is 70 % and the GPRS transmission rate is 0.3 kB/s;
“S: 15%” – the load of RS-485 is 15 %.
Figure 5.3
– Displaying the status of connections on the display
5.2.2.
Operation modes
5.2.2.1.
Connection to the server
EM-481 provides and supports connection to the server specified in the settings. If
“SRV”
LED
is on, it means
that
the connection to server has been done successfully. If
“SRV”
LED blinks, it means that there is data
EM-481
© 2018 Novatek-Electro
FW version 36
E: 5.2k S: 15%
2G: 7-0.3k S: 15%
