relay control from labview

[Krishna_kp]

hello friends, 

i need to control one relay from labview application with respect to the measuring parameter. so for that i need to generate one digital output to switch the relay circuit. while i am seeing, ni boards like 6008, 6009 seems to be more costlier.

please suggest less cost hardware device that support with labview for this.

i need only one digital output.

thank you.  

[sridhar..reddy]

Hi friend ,

I can suggest you to go through modbus Relay boards.

Please go through the link below mentioned.

I think this may usefull to you.

For example:

http://www.canton-electronics.com/mcu-relay-controller-c-53/uart-relay-modules-c-53_54/dc-12v-2ch-rs...

[crossrulz]

If you have a parallel port, you can use that as a cheap DIO.  There are examples floating around the forums for that.

What is the control voltage the relay wants?  What is the control current the relay needs?  Is this an electromechanical relay or a solid state (SSR)?  You may need to design some circuitry to interface whatever DIO line you choose with your relay.

As an alternative, you could look for an RS-232 controlled relay board.  Then you just use simple VISA calls to send messages through a serial port to control the relay.  A quick Google search found a bunch, like this one: SainSmart DC 5V 2-Channel RS232 Serial Control Relay