8.
COMMUNICATIONS USING DEDICATED
PROTOCOLS
MELSEC-A
8.4
Basic
Formats
of
Dedicated
Protocol
There are
4
formats of control protocol.
Any
of these formats can be
designated by selecting the mode setting switch (Section 4.3.1) or mode
number during mode switching. The differences between the control for-
mats (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.
c
I
L
8-6
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