Toho-electronics TRM-006A Manual do Utilizador descarregar pdf (Página 8)

3. TOHO communications control

3.1 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

1ms or more

Response delay:

0-250ms

See "2.8 Setting a response delay."

See "3.6.1 Communications timing."

See "3.6.2 Interval between requests."

3.2 Message types

n 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

n All codes (except for BCC) from STX and data to ETX are expressed in ASCII codes.

n In assembling a program for a high-level computer, see "9. Table of identifiers (codes)" and "10.

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

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