Denford Software & Machines

OK, so to my surprise I have managed to get my Windows 7 laptop to talk to my 1990 FANUC Triac.

I am using a USB to RS232 board like this:https://www.ebay.co.uk/itm/260836648666 and a 9 way to 25 way RS232 lead made up to the specification quoted elsewhere on this site.

I put the machine in DNC mode using M29 and pressing cycle start. A second press of cycle start then starts the LSK light blinking - all good so far.

On the laptop I am using the free version of One CNC's NC-Link.

When I send code from the laptop the mill starts up and follows approximately the first 3 lines of code perfectly. I have noticed that very soon after I start transmitting that the BUF light comes on on the screen.

The software also pauses during the transmission after about 6 lines of code have been sent. When I cancel the transmission, the mill then executes the next three lines (i.e. all that has been sent)

This would appear to be a buffer issue but how do I overcome it? There is no FIFO option in Device manager for the port I am using so cannot find a way to disable it (which is apparently one potential solution?)

Any clues folks?

Thanks,

Charlie.

Hello,

Have you fixed your buffer issue? There is 2 ways to control the buffering on a serial port;

1) By hardware - RTS and CTS signals and the serial cable has to have those lines connected correctly at both ends of the cable with your computer and controller set to use this method of buffer control.

2) By software - using the Xon and Xoff signals that control the data flow to and from the buffer by your transfer program.

Depending on how your machine controller is configured will determine whether you use hardware or software buffer control but both ends of the cable have to be configured to use the same buffer control method with the same baud, parity, and stop bits set.

Kindest regards, John R.