Yes, there is no option to add it with web browser.

Well I use a website browser so is there another way to open the cash register without having to reprint the sales slip? Seems there should be an open register with every print option

We have managed to accomplish the same by using a small custom circuit and a basic webserver that listens on localhost (127.0.0.1) and then sending an AJAX request to it just before print function in pos.ajax.js

Let me know if you need details on how to implement the same.

**[hs](/u/hs)** I will appreciate if you could let me know the details

We have used a USB to Serial adaptor to drive a relay, that when triggered, opens the cash drawer.

To trigger the relay, we have developed a small webserver in C++ that listens to a request on 127.0.0.1 with specific com port as parameter. Once the request is received (eg: http://127.0.0.1/?com=5, where 5 is comport number), the webserver sets the RTS pin low (by default it is high). The relay is connected with RTS port using an inverted driver transistor.

This forum doesn't allow me to attach CPP or ZIP files. Here is the link to the webserver code https://pastebin.com/cbFyYCpr

PS: This solution is for Windows only but can be easily adapted to other OSes.

**[hs](/u/hs)** Thank you for sharing the solution. I will check in future if I could port it for our use.

Would something like a simple paper feed command also trigger the cash box to open? Just have it advance the paper 1 small row as not to waste it

Or a simple print of a "." then advance the paper one line..

Or a simple print of a "." then advance the paper one line..

This solution in not directly linked to printing.

Let me be more specific. The cash drawer was NOT connected to printer in our case. This was the second issue apart from web printing as the customer is using a Laser printer instead of receipt printer (thermal or otherwise, that supports cash drawer). So we have to solve both the problems.

So we came up with small circuit that triggers the cash drawer and a software controller (basic webserver) to do initiate the triggering command.

Let me know if you need more details.