4/29/2011 6:09 PM | |
Joined: 9/27/2006 Last visit: 5/19/2024 Posts: 12257 Rating: (2668) |
Hello automation_1; Start with this information: S7-200 System manual http://support.automation.siemens.com/WW/view/en/1109582 Chapter 7, p. 227: Using the RS-232/PPI Multi-Master Cable and Freeport Mode withRS-232 Devices You can use the RS-232/PPI Multi-Master cable and the Freeport communications functions to connect the S7-200 CPUs to many devices that are compatible with the RS-232 standard. The cable must be set to PPI/Freeport mode (switch 5 = 0) for Freeport operation. Switch 6 selects either Local mode (DCE) (switch 6 = 0), or Remote mode (DTE) (switch 6 = 1). Definition of DCE/DTE from Wilkipedia: http://en.wikipedia.org/wiki/Data_terminal_equipment Data terminal equipment (DTE) is an end instrument that converts user information into signals or reconverts received signals. These can also be called tail circuits. A DTE device communicates with the data circuit-terminating equipment (DCE). The DTE/DCE classification was introduced by IBM So, in the case of IBM computer communications, the DTE was the computer, the DCE was the modem the computer was connected to. Hope this helps, Daniel Chartier |
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