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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
8.4
Basic Formats of Dedicated Protocol
There are
4
formats of control protocol. These control formats are selected
by the mode setting switch (see Section
4.3.1).
The differences between the
(
control formats (based on format 1) are as follows:
Format
2
: Format 1 with block number added,
Format 3
:
Format
1
with STX and ETX added.
Format
4
: Format 1 with CR and LF added.
The following sections describe details of the four control protocols and the
meanings of individual items.
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