Siemens DTU3005-B Betreibershandbuch PDF herunterladen (Seite 20)

4 Creating Project Files — Profibus to Devices

16 Siemens Energy & Automation, Inc.

2 Wire RS422 or RS485 Communications

Check this box only if the communications with your

SEAbus devices use a 2-wire RS485 or RS422 inter-

face (see Figure 4.5). This is the usual method of

connecting SEAbus devices. When 2-wire commu-

nications are being 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.

The remaining configuration selections, except for

intermessage time-out, are the same as those for

Port 1. Refer to Section 4.3 for instructions on these

fields.

Intermessage Time-Out

The DTU3005P uses the intermessage time-out

option to provide slave devices enough time to

respond. When a SEAbus message is received in

Port 3, a timer starts and keeps timing until the SEA-

bus device responds or the timer expires. While the

timer is active, Port 3 does not process any addi-

tional messages transmitting to Port 3.

Note: To change the intermessage time-out

amount, select the Intermessage Time-

Out field and enter the value in millisec-

onds.

After you have entered all of the configuration infor-

mation, select Save. The Information screen dis-

plays a confirmation message indicating that the

configuration is saved (see Figure 4.8). Select Ok to

close the Information screen. Select Revert to

return to the previously saved configuration.

Figure 4.8 SEAbus Device List Menu

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Siemens DTU3005-B Betreibershandbuch Seite 20