Technical Document

ManualsBrandsDevantech ManualsRelay & LED Controllers16A 20 Channel Intelligent Relay Controller

ETH8020 - 20 Relays at 16A, 8 Analogue Inputs

The ETH8020 provides 20 volt free contact relay outputs with a current rating of up to 16Amp each

and 8 analogue inputs. The module is powered from a 12vdc supply which can be regulated or

unregulated. The DC input jack is 2.1mm with positive core polarity, DC supplies are required to

supply at least 1A at 12vdc. The relays are SPCO (Single Pole Change Over) types. The normally open,

normally closed and common pins are all available on the screw terminals.

The Relays on theETH8020 can be controlled from the inputs on the ETH484. This offers the

opportunity to construct a system where an input can control an output anywhere on the earth provided

both locations are connected to the network/internet.

Operating Temperature

-40C to +70C

LED Indication

The ETH8020 provides a red LED mounted immediately next to each relay to indicate whether it is in a

powered state (LED on), there is also two LED's mounted in the Ethernet connector which will flash

with Ethernet traffic. Finally there is a green power LED next to the processor.

Connections

Summary of content (11 pages)

PAGE 1
ETH8020 - 20 Relays at 16A, 8 Analogue Inputs The ETH8020 provides 20 volt free contact relay outputs with a current rating of up to 16Amp each and 8 analogue inputs. The module is powered from a 12vdc supply which can be regulated or unregulated. The DC input jack is 2.1mm with positive core polarity, DC supplies are required to supply at least 1A at 12vdc. The relays are SPCO (Single Pole Change Over) types. The normally open, normally closed and common pins are all available on the screw terminals.
PAGE 2
Relay Power Rating If the contact load voltage and current of the relay are in the region enclosed by the solid and dotted lines in the figure below, the relay can perform stable switching operation. If the relay is used at a voltage or current exceeding this region, the life of the contacts may be significantly shortened. load type Typical applications Rating Non inductive or AC1 slightly inductive loads 16A @ 250V AC Control of electromagnetic AC15 load (>72VA) 3A @ 120V AC 1.
PAGE 3
You should now see the following web page: This web page will allow you to switch the relays on and off by clicking the relay buttons (the red/gray circles). It also contains a link to this technical documentation page. Configuration By clicking the configuration link it's possible to configure the ETH8020 IP address and subnet mask together with the ability to set a password for entry to control screens.
PAGE 4
Factory Reset Should it be necessary to reset the ETH8020 to its shipped condition then the end two contacts of the row of 5 holes near the large chip on the side nearest the Ethernet connection must be shorted together at board power up. Keep the pins shorted until the green power LED starts to flash, this will take up to 5 seconds. The green LED will flash as the settings are reset, please wait until the LED finishes flashing and do not remove power during this period.
PAGE 5
Following a successful connection you will now be able to click the update button to select a file Once the file has been opened the programming sequence will now begin, it's fairly short and following it's completion the board will reset (automatically) and the LED will flash quickly while the programming sequence completes. Do not turn the power off in this sequence.
PAGE 6
Command dec hex 16 10 32 20 33 21 35 23 36 24 37 25 50 32 119 77 120 78 121 79 122 7A 123 7B Action Get Module Info - returns 3 bytes. Module Id (21 for ETH8020), Hardware version, Firmware version.
PAGE 7
Free Contact). This could be from other relay contacts, thermostat contacts, alarm contacts etc. When the contacts are closed the input will read as active. In fact anything that pulls the input pin down to 0v will read as active. Do not think of the inputs in terms of a high or low voltage input. Think of it in terms of Active (or on, something is actively driving the input), or inactive (or off, nothing is driving the input). Command of 0x25 returns 4 bytes. The first 3 bytes are always 0.
PAGE 8
These 6 bytes are then transmitted in the same transaction to the ETH8020 and if the password is correct then 1 will transmitted back, a failure will send 2. The board will now accept changes from the device that entered the password. If communication becomes idle for more than 30 seconds then the password protection is re-enabled. There is also a logout command of 0x7B to enable the protection immediately.
PAGE 9
Test program and example source code To get the ETH8020 up and running in the minimum amount of time we have put together an example program to demonstrate the functionality of the module.We provide the full source code for this program. You may examine this code to see how it works or use it as a starting point for your own application. Visual studio express C# examples The test program is available as Visual C# express ready built installation files, or as Visual C# express project with source files.
PAGE 10
After logging on to your routers setup page, the first thing to do is create a new service. Click on the "Services" menu then "Add Custom Service". Enter a name for the service, select TCP and enter the ETH8020's port address for both the start and finish ports. Click "Apply". Now go to the "Firewall Rules" menu and click "Add" in the Inbound services section. Select the ETH8020 service and ALLOW always. The "Send to LAN Server" IP address is the ETH8020's IP address, 192.168.0.
PAGE 11
To test this you will need a computer that has its own internet connection and is NOT connected to the same network as the ETH8020. Download and run the test program above and select Custom IP. In the pop-up box enter your routers internet facing IP address. Click on "Try IP" and it will connect you to the ETH8020 just as if it were on your own network. Android & iPhone Apps. We have a free app IO network available for Android and iPhone to remotely control your relays, download from Google Play or iTunes.