Editing Modbus protokoll rs485 (section)

=== Modbus Funktions Codes ===

{| class="wikitable"
! colspan="5"| Hex Data !! colspan="1"| Funktion 
|-
| adr || fc  || ! colspan="3"| data .....  || 
|-
| ..  || 01  || ..  ||  ..  ||..  ||  Lese Ausgangsbit Status
|-
| ..  || 02  || ..  ||  ..  ||..  || Lese Eingangsbit Status 
|-
| ..  || 03  || ..  ||  ..  ||..  || Lese Holding-Register Analog Ausgang 
|-
| ..  || 04  || ..  ||  ..  ||..  || Lese Input-Register Analog Eingang 
|-
| ..  || 05  || ..  ||  ..  ||..  || Schreibe Ausgangsbit 
|-
| ..  || 06  || ..  ||  ..  ||..  || Schreibe Holding-Register Analog Ausgang 
|-
| ..  || 0F  || ..  ||  ..  ||..  || * Funktion noch offen   
|-
| ..  || 10  || ..  ||  ..  ||..  || wird bei den China Modulen zum Anpassen der UID benutzt 
|-
| ..  || 15  || ..  ||  ..  ||..  || Schreibe mehrfach Ausgangsbit  
|-
| ..  || 16  || ..  ||  ..  ||..  || Schreibe mehrfach Holding-Register (Daten für >16-bit) Analog Ausgang 
|-
| ..  || 23  || ..  ||  ..  ||..  || *  Funktion noch offen 
|-
|}

* das sind wohl noch nicht alle Modbus Funktion Codes
es gibt wohl auch Sonderfunktionen die nur bei bstimmten Geräten vorhanden sind hier z.B. 0x10h setzten der UID 


<br>
adr  -> device Adress oder auch UID - 1 Byte lang <br>
fc   -> Function Code 1 Byte <br>
data -> n Bytes<br>

Modbus RTU Instructions:

Baud rate: 9600 8 NONE 1

Hexadecimal send<br>
hexadecimal receive<br>
<br>
Operation steps:<br>
1. Software settings communication baud rate<br>
2. Set the address (communication using the device address, the default address is 01)<br>
<br>
Set the address from from Broadcast to 0x01 , 0x02 , 0x03

{| class="wikitable"
|-
! Hex Byte  !! Funktion  
|-
| 00 10 00 00 00 01 02 00 01 6A 00  || Broadcast Address Modified to 01
|-
| 00 10 00 00 00 01 02 00 02 2A 01  || Broadcast Address Modified to 02
|-
| 00 10 00 00 00 01 02 00 03 EB C1   || Broadcast Address Modified to 03
|}
<br>

Read Address at Broadcast Call <br>

{| class="wikitable"
|-
! Hex Byte  !! Funktion  
|-
| 00 03 00 00 00 01 85 db  || Send to Device ( Broadcast ) 
|-
| 00 03 02 00 01 44 44     || Receive from Device  '''01 for Address'''
|-
| 00 03 02 00 02 04 45     || Receive from Device  '''02 for Address'''
|-
| 00 03 02 00 03 C5 85     || Receive from Device  '''03 for Address'''
|-
|}
<br>