talking to USB Relay Module

I have a USB relay module

this one: https://www.sainsmart.com/products/4-channel-5v-usb-relay-module

that has an FT245RL onboard running the relays. The drivers are installed correctly, and I can see the board on COM3. I create a serial port object thus:

relay = serialport('COM3',9600,'Parity','none','DataBits',8,'StopBits',1);

but when i try to send a command (e.g. write(relay,1,"uint8")), i get no response. I can run the board usaing a stand-alone app (USB 8 Relay Manager v.1.4.exe), and after i have used that app to toggle the relays, I can then operate hte relays with my matlab code (after closing out the stand alone relay app of course).

So what's going on here?

[Eduard Mauri Rodriguez]

Hello Steve,

Did you find a solution to the problem? Because I'm currently having the same problem and still haven't found a solution.

Thank you very much,

Edu

Answer 1

[steve solomon]

ended up writing my own driver, never got it to work with native matlab functions.

[Eduard Mauri Rodriguez]

Oh... I've now found out that a Initialization file is required. I'll see if it works, otherwise I'll have to proceed as you did.

Thanks!

[steve solomon]

let me know if that doesnt do the trick and I will dig up the driver so you dont have to reinvent that particular wheel.