Toho-electronics TTX-700 Instrukcja Użytkownika Pobierz pdf (Strona 3)

6 MODBUS communications control...................................................................................................... 20

6.1 Communications procedure........................................................................................................ 20

6.2 Message types ............................................................................................................................ 20

6.3 Composition of an RTU request message

(transmitted from a high-level computer to this product)........................................................... 21

6.4 Composition of an RTU response message

(transmitted from this product to a high-level computer)........................................................... 22

6.5 Description of RTU codes .......................................................................................................... 23

6.6 Precautions on RTU communications ........................................................................................ 25

6.7 Example of CRC-16 calculations ............................................................................................... 26

6.8 Composition of an ASCII request message

(transmitted from a high-level computer to this product)........................................................... 27

6.9 Composition of ASCII response messages

(transmitted from this product to a high-level computer)........................................................... 28

6.10 Description of ASCII codes........................................................................................................ 30

6.11 Precautions on ASCII communications...................................................................................... 32

6.12 Example of LRC calculations..................................................................................................... 33

7. Specifications........................................................................................................................................ 34

7.1 Communications standard category: Compliant with EIA standard RS-485 ............................. 34

7.2 Communications specifications.................................................................................................. 34

8. Connections........................................................................................................................................... 35

8.1 Connections for the RS-485 ....................................................................................................... 35

9. Table of ASCII codes ............................................................................................................................ 36

10. Table of identifiers (codes).................................................................................................................... 37

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