Siemens DTU3005-B Manual del operador descargar pdf (Pagina 17)

4 Creating Project Files — Profibus to Devices

Siemens Energy & Automation, Inc. 13

4.3 Device Setup—Port 2

One or more Siemens devices may be connected to

Port 2. To configure Port 2, select Port 2 (Devices)

from the Edit menu. The configuration screen is dis-

played (see Figure 4.4).

Figure 4.4 Port 2 Devices Configuration Screen

Device Protocol

The first field, Device Protocol, determines which

Siemens devices can be connected to Port 2. There

are the following two choices in the list box:

• SEAbus —for connection to Siemens ACCESS

communicating trip units, relays, power meters

and other devices.

• VDEW—for connection to Siemens protective

relays using the VDEW protocol

Not all Siemens devices are supported. For a list of

supported devices, see Appendix A.

2 Wire RS422 or RS485 Communications

Check this box if the communications wiring with

your devices is a 2-wire RS485 or RS422 interface

(see Figure 4.5). When 2-wire communications are

used, RTS must be looped back to CTS on the DTU

side of the cable. This can be done on the RS232

side by looping pins 4 and 5 or on the RS422/485

side by looping pins 16 to 18 and 17 to 19. RS-485 is

the standard communications interface used by

ACCESS devices.

Figure 4.5 DB-25 / RS-485 Connector (two-wire)

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 119 120

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Siemens DTU3005-B Manual del operador Pagina 17