Devantech dS378 8 x 16A Ethernet Relay Board

The dS378 is an Ethernet connected relay module featuring 8 channels of 16Amp 250Vac relays. Each relay has both normally open (NO) and normally closed (NC) as well as the common available on three terminals. The dS378 has four built-in control methods. The primary control method is graphically by using its built-in secure website.

Secondary control may be one of: ASCII - type in commands via a program such as PuTTY. Binary - Command set using binary codes Modbus – Functions 1, 4, 5, and 15 supported

Hardware

• Serial ports - 2 x TTL level serial ports, 1 x RS485 port.
• Relays - 8 with up to 16Amp @24vdc or 250vac, screw Terminals for N/O N/C and Common contacts
• I/O - 7 flexible channels, your choice of VFC input, NPN output or 10-bit analogue input.
• Communication - USB for development, RJ45 Ethernet for normal access
• Power - 12V DC jack 2.1mm (adaptor sold separately)

The dS378 provides eight (8) volt free contact relay outputs with a current rating of up to16Amp each, 7 flexible I/O's which can be analogue or digital, 2 serial ports (3.3v level) and an RS485 serial port. The module is powered from a 12vdc supply which can be regulated or unregulated. The relays are SPCO (Single Pole Change Over) types. The normally open, normally closed and common pins are all available on the screw terminals.

LED indication

The dS378 provides a red LED mounted immediately next to each relay to indicate whether it is in a powered state (LED on), there are also two LED's mounted in the Ethernet connector which will flash with Ethernet traffic. A row of three LEDs, Blue, Green and Red, are available for status indication. The Red LED lights when the module is in bootloader mode – this is when the IDE is uploading system firmware to the module. The Green LED lights the board begins running user programs. All three LEDs are available and can be controlled as digitalports 33-35.

The “FlashingLeds” example provides a colourful display showing how to use them. There are also LEDs on the I/O lines. These indicate the I/O status in digital output and VFC input modes only.

Power supply

The dS378 requires a 12v DC supply capable of supplying a minimum of 1A. This is most easily provided by a low cost mains adapter. A suitable universal adapter is available on our website and may be ordered along with the modules. Connection is via the 2.1mm DC jack socket. Positive on the center pin.

Operating temperature

-40C to +70C

Power relays

Eight 16A volt free contact relays are provided for switching a common input between a normally closed output and a normally open output. The relay coil is powered by the 12vdc incoming supply on user command.

Connection examples

Example input - connecting a switch

Connecting a simple switch could not be easier, just wire the switch between a pin (P) and ground (0v). When the switch closes the input will become active.

Make sure you use the 1 option in the digitalport declaration to enable the ports passive pull-up

Example output - connect a relay

You can connect your own 12V relays, the first coil pin of the relay is wired to the 12V supply terminals on the board, the other is wired to the output pin (P). When the output pin becomes active it is driven down to 0V ground, the relay will have 12V across the terminals and switch, so COM is connected to NO (Normally Open).