8·5
Control Method and Transmission Protocol
In
the
RS·232C
level
interface,
the
data send/receive control
method and
the
transmission protocol are
not
standardized.
Various control methods and transmission protocols are
8-5·1 Control method
used depending on equipment. Presented below are
the
control method and
the
transmission protocol used
in
the
Programmer.
SERIAL
MODE
START
or
REMOTE
MODE
START
Send
CTS
DSR
ON
ON
E·11
indication
Next
processing
Notes: The RS·232C I/F for
the
Programmer uses communi·
cation interface
ICs
equivalent
to
8251A. Data may
be
sent
only with the RTS signal
on;
(otherwise,
the
8251A
provides hardware inhibition.) Both send and
receive are enabled by
the
turned on DTR signal. If
this signal
is
off,
"E·11"
is
displayed
on
the
LED
panel, and the Programmer waits for
the
DTR
to
be
turned on.
38
Receive
Next
processing
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