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Application Note

Using ELPRO 805U Modems with Profibus

©ELPRO Technologies Pty Ltd August 2001

Page 3 of 7 APP_805U_PROFIBUS_R1-0.Doc

Configuration for 19,200 baud operation

805U Modem Configuration

The following table lists the configuration settings for the 805U. From Factory defaults,

the following settings are required.

Radio Baud Rate: 19,200 baud (Factory Default)

Serial Baud Rate : 19,200 baud

Character Format: 8 data, even parity, 1 stop.

Error Checking : Enabled

Flow Control: RS-485 Mode (Factory Default except prior to version 1.7).

Profibus Network Configuration

The Profibus network is configured with a T_Slot time of 1500, T_Set value of 200 bits,

and a Max_T_Sdr time of 450 bits. The Profibus Data rate is set to 19,200 baud. The

following diagrams show the screens required for configuration of a Siemens S7 PLC

using STEP7 configuration software.

AT&F

AT C6 &B14 &E1 &K4

at&v

B0 C6 E1 Q0 V1 X0 &B14 &C1 &D0 &E1 &G0 &K4 &L1 &M0 &N1 &S100 &U1 \T0

S0:1 S1:50 S2:43 S3:13 S4:10 S5:8 S6:0 S7:5 S8:0 S9:85 S10:1 S11:0 S12:1

S13:3 S14:255 S15:0 S16:0 S17:0 S18:0 S19:0 S20:100

&Z0= &Z1=

&Z2= &Z3=

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Elpro Technologies 105U-G Spécifications Page 61