Toho-electronics TTM200 Manuel d'utilisateur télécharger pdf (Page 17)

6. MODBUS communications control

6.1 Communications procedure

This product returns a "response message" in response to a "request message" from a high-level

computer. It therefore does not initiate a transmission.

High-level computer

This product

Request message

Response message

Request message

Response message

Transmitted by a high-

level computer

Transmitted by this

product

Transmitted by a high-

level computer

Transmitted by this

product

Response delay:

0-250ms

See "5.8 Setting a response delay."

See "6.6.1 Communications timing."

See "6.6.2 Interval between requests."

2 ms or more

6.2 Message types

 Messages are roughly divided into the following types:

Read request message

Write request message

Store request message

Request message (transmitted

from a high-level computer)

Response message (transmitted

from this product)

Receipt acknowledgement and data

response

Write complete response

Reception error and error description

response

Store complete response

: Response when a normal "request message" is received

: When a received "request message" contains an error

 In RTU codes, the data is binary.

 In ASCII codes, all codes are expressed in ASCII codes.

 In assembling a program for a high-level computer, see "10. Table of identifiers (codes)" and "11.

Table of ASCII codes" at the end of the book.

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 50 51

Commentaires sur ces manuels

Pas de commentaire

Toho-electronics TTM200 Manuel d'utilisateur Page 17

Commentaires sur ces manuels

Produits connexes et manuels pour Capteurs Toho-electronics TTM200