RS485 For Hypertherms

Old fishermen never die, they just smell that way
;-(

phillc54 wrote: In the Hypertherm docs they mention a CR/LF at the end of transmission from master to slave but when they mention the reply there is no CR/LF. Is this correct?

Edit: Hey Rod I see one of Toms links is from your neck of the woods.

Phill, I think the answer is on page 4. They assume your software strips out the CRLF terminator

CR/LF Carriage return, line feed in hexadecimal: 0D0A. The end characters are typcially removed on incoming messages by the CNC.

And yes, I lived in Toowoomba where USQ is for a few years.

rodw wrote: Phill, I think the answer is on page 4. They assume your software strips out the CRLF terminator

CR/LF Carriage return, line feed in hexadecimal: 0D0A. The end characters are typcially removed on incoming messages by the CNC.

Well, I have read that doc a gazillion times (or I thought I had) and didn't see that bit. I think this is frustrating me, I'll take a short break...

phillc54 wrote: Well, I have read that doc a gazillion times (or I thought I had) and didn't see that bit. I think this is frustrating me, I'll take a short break...

That was my experience learning Modbus RTU/ASCII as well,

What makes things more fun is the way the register values start, It can either start with a 0 or 1 depending on vendor it could be one of either! I have a servo drive that I programed a PLC to control and setting up the Modbus code first time was a real head fuck.

It is even harder when you spend a day and a half trying to get your virtual machine talking to a USB-RS485 converter. In the end I gave up and downloaded VirtualBox, converted the VMware appliance and imported it as a VirtualBox appliance and it worked.
Now I need to make me an Arduino PM-XP emulator so I can talk to something...

The best is to get one of the free serial analyzers and sniff both sides of your communication with a second pc... One look on the screen and you win lot of time..