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EasyDaq launches new sequencing start relay card

17 June 2019

EasyDaq’s new product came from a need to power up six 200W power supplies on a machine without over loading the mains supply on start-up. Switching on the power supplies one at a time overcame the problem.

Changeover Relay (SPDT) outputs are accessed via two-part connectors

On power up, the 8 Opto-isolated relays are sequentially enabled by a dedicated processor at 1-second intervals. The relays remain energised until the power is removed. The individual digital signals are available, along with power on a 15-way, D-type connector.

Changeover Relay (SPDT) outputs are accessed via two-part connectors as shown in the picture. This version uses 6V rated relays for low power consumption at 5V operation. 

Sequential start up could be useful for applications requiring timing and sequence. EasyDaq can customise SEQ8 settings. 

The SEQ8 range of cards, with 5V or 6V, and single or two part connection options is the latest to join Easydaq’s vast range of relay card and data collection cards. All Easydaq products are designed and built in the UK.

Relay card uses, variations and configurations

Relay cards are incredibly useful in providing control over systems. Typical applications include security and access, control of laboratory and medical equipment, pump and irrigation control, test equipment operation, military applications, and monitoring equipment control. Not limited to industrial use, relay cards are an integral part of scientific, academic, and research projects as well as home automation and hobbyist applications. 


Easydaq cards vary from 4-96 relays and they are code compatible. There are signal or power relays. Power versions are available with 5V,6V or 12V operating relays. The boards can be digital, serial, USB & Ethernet controlled.

Let’s have a look at the USB4SRMx.

The one depicted in the image on the left is USB controlled and powered, with 4 opto-isolated relays and four general purpose digital I/O channels. 

The relays are high sensitivity (gold contact) signal relays (30V DC at 1A). Access to all relay contacts and the 4 DIO channels is via fixed screw terminal block connectors along the edge of the card. 

It is suitable for a wide range of control and signal switching purposes. There is screw terminal access to the USB power for possible onward powering/use in your target system. There are +5V & relay channel LED status indicators. 

Nylon feet are fitted in each corner, which will take self-tapping screws. They can be removed to allow the cards to be mounted on pillars or stacked. A Perspex cover can add general protection of the card and prevent accidental contact with relay contacts or screw terminal connections. DIN rail mounts will fit.

Plug it in and it will be recognised as a serial port. Once setup, you can access or control from any web/browser enabled device or phone. Program using C++, LabVIEW, Java, Perl, Python, Ruby, PHP or Ajax options. 

Relay cards can be stacked, mounted on a DIN rail or stand on their own four feet


Relay cards can be:

• Stacked

• Mounted on a DIN rail

• Or they can stand on their own four feet!

The future

As code for the various processors used in the range of relay cards can easily be written, a whole new branch of possibilities opens up. Easydaq can provide customised programming and welcome ideas for new products, variations and applications.

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