write multiple register using modbus library

[gdah]

hi...i have some problem when write multiple register using modbus library. I realize that when I send more that 1 data ther will be error out and no receive frame from device. my LV is ok when i only send 1 data. plz view my attchments files. tq

[BrokenArrow]

QUOTE(gdah @ Nov 19 2007, 11:39 PM)

hi...i have some problem when write multiple register using modbus library. I realize that when I send more that 1 data ther will be error out and no receive frame from device. my LV is ok when i only send 1 data. plz view my attchments files. tq

Do you know how modbus works? Your data is heavily laden with a header and footer, address information, possibly a checksum and even a 2's compliment flux capacitor on the end. Point is, One packet expects One message, so don't send more than "1 data". I hope my answer is at least as clear as your question.