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4. Communication format
The communication formats of the commands and responses between IV-S51M and a personal
computer are outlined below.
Command
: Station No. *
Header
(1)
Response
: Station No. *
Header
(1) Station No.: 00 to 7F(H)
(2) Processing code and text
• They depend on the contents of processing
• On abnormal termination, no text is provided.
(3) Termination code
• The termination code is a 4-digit hexadecimal number.
• When an output is sent through the general purpose serial I/F, 0000(H) is sent on normal
termination.
• On abnormal termination, a code is more than 0001 (H). (The errors are described in the
separate page.)
(4) Checksum code (SC(H), SC(L))
• To improve the reliability of the transmitted data, in addition to a parity check, error detection by
checksum is used for error detection.
*
*
*
Processing code (2)
*
*
*
RC RC RC RC
H
(1)
Processing code (2)
*
• • • • • • •
*
*
Text (2)
*
• • • • • •
(L )
• • •
• • •
Termination code(3)
6 - 3
SC SC CR
(H ) (L )
Terminator
Checksum code (4)
*
*
SC SC CR
(H ) (L )
Text (2)
Terminator
Checksum code (4)
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