Contents
4.8 Checksum (CRC16) .................................................................................... 27
4.9 Error messages .......................................................................................... 28
4.9.1 Modbus error codes ..................................................................................... 28
4.9.2 Error messages for invalid values ................................................................ 29
4.9.3 Error codes as integer return values ............................................................ 30
5 Serial protocol types 35
5.1 Modbus slave .............................................................................................. 35
5.2 Modbus master .......................................................................................... 38
5.3 Barcode ....................................................................................................... 39
6 Ethernet protocols 41
6.1 HTTP ............................................................................................................ 41
6.2 Browser connection ................................................................................... 41
6.3 Modbus TCP ............................................................................................... 42
6.4 Email (SMTP and POP3) ............................................................................. 44
7 Address tables 47
7.1 Data types and type of access .................................................................. 47
7.2 Modbus addresses of important device and process data .................... 47
8Index 65
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