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805U_Radio-Modem_Proﬁ bus

0508

PURPOSE

The ELPRO 805U radio modems may be used to extend a Profibus Network. The

Profibus network must be configured to account for the increased delays in data

transmission caused by the radio modems. Also, the profibus network must be connected

to the modem correctly to ensure operation of the network. This document describes the

configuration required.

Baud Rate Selection

The ELPRO Modems support the following baud rates in common with the Profibus

standard. 19200 Baud, 93750 Baud. One of these rates must be used for the system to

operate successfully. For maximum reliability, use 19200 baud for both the Profibus

network and the serial port on the radio, and set the radio rate to 19200 baud. For

maximum speed, select 93750 baud for the Profibus network, and select 76,800 baud

radio rate for 805U modems. The 93750 baud option for the radio modems may not be

available from the configuration software. In this case, use a terminal package to set the

baud rate to 93750 baud. The command to select 93750 baud is ATC13. Once this

command is entered, the modem will change baud rate, so issue the command

“ATC13&W” to write the configuration to non-volatile memory. To communicate with

the modem again, Set DIP switch 2 on, and reset the modem.

Connection

The ELPRO Modems have two terminals marked “A” and “B” for connection to RS-485

networks. Profibus uses RS-485 standard for it’s physical layer network. The two RS-485

lines are labelled “A” and “B” in Profibus networks, however the usage is opposite to the

normally accepted RS-485 usage. This means you must connect Profibus “A” to

ELPRO “B” and Profibus “B” to ELPRO “A” for correct operation.

RS-485

Signal

Name

Profibus

Signal

Name

Pin –

Profibus D

Connector

Signal Description.

“A” “B” Pin 3 Positive Signal – High = Logic “1”, Low = Logic “0”

“B” “A” Pin 8 Negative Signal – High = Logic “0”, Low = Logic “1”

ELPRO Technologies Pty Ltd

Using ELPRO 805U Radio Modems with Profibus APP_805U_PROFIBUS_R1-0.Doc

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Elpro Technologies 105U-G Spécifications Page 59