Yokogawa Touch Screen GP20 - Manual (Page 70)

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IM 04L51B01-17EN
Data Block
The actual output data. The format varies depending on the output content. For details, see
section 2.11 , “ Format of the Data Block of Binary Output .”
Data sum (16 bits, big endian)
The data sum block indicates the sum of the data block. Use the CCheckSum command to
specify whether to include data sum. By default, check sum is set to “No.” Whether data sum
is included is expressed by a flag in the header block. If the data sum block is not included,
the area itself will not be included. For the check sum calculation method, see Appendix 5
Check Sum Calculation Method .
2.9.4 Output in Response to RS-422/485 Commands
The table below shows the responses to the ESC O command and ESC C command. ESC
in ASCII code is 0x1B. For details, see Appendix 1 ASCII Character Codes .
Syntax Meaning Response
ESC O_xxCRLF
(_: Space)
Opens an
instrument
• Response from the destination instrument
ESC OxxCRLF
• If there is no instrument at the address specified by
the command *
No response
ESC C_xxCRLF
(_: Space)
Closes an
instrument
• Response from the destination instrument
ESC CxxCRLF
• If there is no instrument at the address specified by
the command *
No response
* Some possible reasons why the condition “there is no instrument at the address
specified by the command” occurs are command error, the address assigned to the
instrument is different, the instrument is not turned on, and the instrument is not
connected through serial interface.
• “xx” in the table represents the instrument address. You can specify any address within
the range of 01 to 99 and within the addresses assigned to the communication target
instruments.
• You can only open one instrument at any given time.
• When you open an instrument with the ESC O command, you can send commands to it.
• If you open an instrument with the ESC O command, any instrument that is already open
will be automatically closed.
• Use CR+LF for the terminator.
2.9 Responses to Commands