In SX Microcontrollers, SX/B Compiler and SX-Key Tool, lesbleus wrote: Thanks so much your reply, bean. As for the power supply of the inkjet board, I am using the the USB port of PC for powering the board because the USB port can suppy 5V which is the same as that described as in the instruction. A USB to RS232 wire is then used to connect the inkjet board to the usb port. I suspect that it's correct. As said in the instructions for "96 dpi Serial Inkjet Printer Development Kit (#27949)", the screen of the hyperterminal will display the prompt character ">" when the kit is ready to accept data. But I didn't see this character. Then I tried to send HELLO commands to the kit. There is not any response from the kit. i tried also the LED display. it seems that i still didn't the prompt character ">". i am wondering if I need additional power supply. Thanks again, bean. George P.S. the instruction of the kit :http://www.parallax.com/dl/docs/prod/robo/InkjetKitDocs-v1.0.pdf ---------- End of Message ---------- You can view the post on-line at: http://forums.parallax.com/forums/default.aspx?f=7&p=1&m=242245#m242288 Need assistance? Send an email to the Forum Administrator at forumadmin@parallax.com The Parallax Forums are powered by dotNetBB Forums, copyright 2002-2008 (http://www.dotNetBB.com)