Toho-electronics TTX-700 Manual de usuario descargar pdf (Pagina 24)

e) CRC-16

This error check code is for detecting message errors. This transmits a CRC-16 (tour

redundancy code).

The multinomial for generating a CRC-16 used in this product is X

+1.

To learn how to calculate the CRC-16, see "6.7. Example of CRC-16 calculations."

To affix an error code at the end of the message, affix the low-level byte first, then the

high-level byte of the CRC.

f) Number of data

This specifies the number of registers to be read and written x 2. Since the number of

registered in this product is fixed at 2, specify 04H here.

g) Data portion

This specifies data to be written in the register. The data is fixed at 4 bytes. This product

will write data without the decimal point.

Example: In the case of numerical data

Example Significance of the value

Proportional band (P) = 1.0 % 0000000AH

PV = 1200.0°C 00002EE0H

SV = -10.00°C FFFFFC18H

In the case of text data, write the ASCII code "□INP" (□ is a space): 2049E50H.

h) Error code

If a message from a high-level computer is error-ridden, it will be incorporated in the

"response message" from this product and returned.

The error number "04" is an instrument error (memory error or A/D conversion error, AT

error). It will be incorporated in the "response message" regardless of whether there is an

error in the "request message."

If there are two or more errors occurring at the same time, the largest error number will be

incorporated.

The table below indicates the error contents and classifications.

Error No. Error contents in the "request message" received by this product

01 Received an unsupported function code.

02 Received an address other than the specified one.

03 The numerical data deviated from the "range of settings designated specifically with

setting items."

04 Instrument error (memory error or A/D conversion error, AT error)

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Toho-electronics TTX-700 Manual de usuario Pagina 24