PlotterHPGL

Library and examples to interface a HPGL plotter such as HP7550a to processing.

To use just download the whole repository and put it in your Processing folder. There is a couple of exampels that shows the capabilities of the library in the examples folder. Hopefully they should be self explanatory.

##Hardware

You need a USB to DB25 converter to interface to a HP7550a. Im using this this bought at Amazon. It has the ch340 chipset inside that needs this drivers:

Chinese manufacturer: http://www.wch.cn/downloads.php?name=pro&proid=5

and then on OSX you need to do:

1. Install the CH340 driver
2. Run this command in Terminal: sudo nvram boot-args="kext-dev-mode=1"
3. Reboot

this sequence is originaly created by Alexandre de Pellegrin

On the Plotter you need to setup this configuration:

• Baudrate 9600
• Handshake: Xon/Xoff Direct
• Data flow: Local Standalone (this seems to reset after power down of plotter on my machine)
• Bypass: OFF
• Duplex: Full
• Parity: 8-bits OFF

To access the submenu for this settings on the HP7550a press:

1. "Next Display"
2. "Enter"
3. "Next Display"
4. "Serial"

Feel free to fork, reuse and redistrube as you wish.

Happy plotting