No, from what I gather the clients have the scales, and the server is what processes those scale readings for whatever purpose. In short, you can't do it with PHP, unless the scale is connected to the server. Two, and this isn't nearly as important in the vast majority of cases, you're trusting the browser's results. You'd need to get around it by using an ActiveX object or a Firefox extension (depending on your browser requirements), which isn't necessarily a trivial task. Here you run into two problems: One, no browser, by default, will allow you to read from the serial port. Download drivers for most types of USB to serial adapters and converters. USB to serial drivers for most serial RS232 devices. It can open a connection with a USB serial port of a given name on Linux. Do you know of a way I can check to see if the serial port is even being hit? This class can communicate with a Arduino board via serial port.

Is it possible to read a com or usb scale from PHP? Ubuntu Forums >The Ubuntu Forum. Browse other questions tagged php linux serial-port usb or ask your own question. Reading and writing to/from serial device via USB on Linux with perl or PHP. You could, however, have the client read the serial port for you and return the results. You can't have the server remotely read serial ports unless you had some program installed that would allow you to do so, which would kind of defeat the purpose of using a web based client. Especially not with a 'direct' IO library (going over the network would be the opposite of direct). The server can't do anything directly to the client machine.

You want to use PHP to read a remote computer's serial or USB port remotely? That's not possible. Steve Lawler Dark Percussive House & Techno more. The client machine with the scale(s) would most likely be windows machines, I suppose we could set up one machine specifically for the scale though, that could linux-based if it'd be easier, I suppose, though I'd prefer not to go this route. The client machine obviously wouldn't be the server, but I was thinking I could read the serial port by specifing something like this: dio_open('129.168.0.120:COM1') or maybe fopen? Would this suffice for this project? Any other solutions.

From the research I've already done, there is a direct I/O (DIO) package in php, though it was built in with php4 and is now a pecl package for php5. The situation I envision is as such: The user chooses which scale they want (assuming there isn't just one) and presses a button to read the weight off that scale (assuming there is something on it). I'm investigating if it would be possible to read from a serial port or USB port - the scale has both connections available. We have a web application (PHP-based) that involves part weights.

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