On Mon, 2008-01-21 at 00:25 -0800, Kirk Wallace wrote: > I have a Hitachi SJ200 VFD which has RS-485 Modbus RTD built in. There > is an RJ45 connector which has two pins for Modbus. One for Data+ and > another for Data-. So, I guess, send and receive are on the same wire > using half-duplex. What is the most common way to connect this to a PC?
This document seems to have the answer (page 21 and 22): http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf I can use something like: http://datasheets.maxim-ic.com/en/ds/MAX3440E-MAX3444E.pdf connected to the serial port. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe, Bridgeport mill conversion, doing XY now, Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
