Siemens DTU3005-B Betreibershandbuch PDF herunterladen (Seite 18)

4 Creating Project Files — Profibus to Devices

14 Siemens Energy & Automation, Inc.

Communications Settings

These settings set up the Baud rate and other com-

munications parameters used by the devices.

Note: To move between the communications

settings, press the Ta b or Enter keys. To

select a setting, use the Up or Down

Arrow key to move to the desired setting

and press the Space Bar to change your

selection.

RTS Control (Request to Send Control)

RTS Control selection is an option for modems that

require RTS to be active only while the DTU is trans-

mitting to the devices. If the RTS/CTS check box is

selected, the DTU will activate RTS and wait until

CTS is active before transmitting. If the RTS Delay

check box is selected, the DTU will activate RTS and

wait for the specified delay time to pass before

transmitting. When RTS Delay is selected, the pro-

gram displays an entry box for the RTS delay time. In

the RTS Delay field, enter the delay time in millisec-

onds.

Response Time-Out

The Response Time-Out tells the DTU how long to

wait for a response after transmitting a request to

the devices. If no response has been received from

the devices after the specified amount of time

passes, the DTU will assume that no response is

coming and will retry the request. Enter the time in

the Response Time-Out field in milliseconds.

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. Select Ok to close the Infor-

mation screen. Select Revert to return to the previ-

ously saved configuration.

Note: If you have changed the configuration and

have not saved it to the project file, you

will be prompted to either save or discard

your changes.

When VDEW is selected as the device protocol, the

Edit menu changes to reflect the different configura-

tion options it uses (see Figure 4.6).

Figure 4.6 Edit Menu with Configuration Options for the VDEW Protocol Option

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