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5 Creating Project Files—Modbus Master to Devices

Siemens Energy & Automation, Inc. 33

5.5 Modbus/Passthrough Setup—Port

Port 3 can be used for passthrough communications

to your Siemens SEAbus devices or for connection to

a second Modbus Master device. Passthrough com-

munications enables a PC running WinPM, or other

supervisory software connected to port 3 of the

DTU3005 to communicate directly with the SEAbus

devices connected to port 2. In passthrough mode,

any messages received on port 3 of the DTU are sim-

ply “passed through” to the devices.

Passthrough communications are not available for

VDEW devices; see Section 5.3 for Port 3 (Modbus

Master) configuration of VDEW devices.

You must have a Modbus Master to Devices project

file open to configure port 3 using the instructions in

this section. Select Port 3 (Modbus/Passthrough) from

the Edit menu, and the Port 3 configuration screen

appears.

The first option on the configuration screen allows you

to choose connection to a second Modbus Master

device or passthrough to port 2. Select the appropriate

configuration with the mouse, or use the Up or Down

Arrow keys to highlight the selection and press the

spacebar.

Modbus Master

If you select Modbus Master, the screen appears as

shown above. Select the Modbus protocol by select-

ing the Modbus Protocol list box, highlighting either

ASCII or RTU, and pressing Enter. After you have

selected your protocol, press the Tab key to highlight

the Modbus ID selection box. The Modbus ID is used

to identify which Modbus Master device the DTU is to

communicate with. Type in the Modbus ID number

and press Enter.

The remaining configuration selections are for the

communications parameters and have the same

choices as those for port 1. Refer to Section 5.3 for

instructions on these fields.

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Siemens DTU3005-B Betreibershandbuch Seite 37