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Application Note 455U-D Radio Modem with Profibus

Issue 1.0 – December/06

©ELPRO Technologies Pty Ltd

Page 2 of 6

app_455UD_PROFIBUS_1.0.doc

Profibus Communications Cable

Profibus communications is transported via RS485. However Profibus devices all use DB9

connectors for interfacing

The Profibus RS485 connection should be made only to pins 3 and 8 of the Profibus D9 connector.

The pinouts for this connector are:

Pin Description 455U

1 Not connected

2 Not connected

3 +ve RS485 (Positive) A

4 RTS (request to send)

5 GND - Isolated GND from RS485 side

6 +5V - Isolated 5V from RS485 side

7 Not connected

-ve RS485 (Negative)

9 Not connected

Power Connections

The 455U-D module is powered either by a 12 - 15VDC supply, or a 15-28VDC supply. Minimum

24 Watt capacity.

The 12-15 V Supply may be used to charge a backup battery (12V Lead-acid) when the main

supply is available, and the module will automatically change over to run from the backup battery

in the case of main supply failure.

For DC supplies, the negative side of the supply is connected to “ground”. The supply negative is

connected to the module case internally. The positive side of the supply must not be connected to

earth. The DC supply may be a floating supply or negatively grounded.

The power requirements of the 455U-D units is 90mA at 12VDC (Quiescent) and 2A at 12VDC

when transmitting (5Watt).

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Elpro Technologies 105U-G Spécifications Page 54