f-
--
1'
1.
GENERAL DESCRIPTION
MELSEC-A
1.
GENERAL
DESCRIPTION
This User's Manual describes the specifications, handling and transmission
control protocols of the
AJ71 C24-S8
computer link module.
The
AJ71C24-58
has one
RS-232C
port
and one
RS-422
port. It is the
interface between a
PC CPU
and an external device (such as a computer or
printer) or to the
CPU
of another
PC
station.
Dedicated transmission protocols
1
to
4
are used as transmission control
procedures on the
AJ71 C24-S8
and a no-protocol mode and a bidirectional
mode are also available. The user can select and set these independently
for the
RS-232C
and
RS-422
ports.
When using
a
dedicated transmission protocol or the no-protocol
mode/bidirectional mode, data
is
transmitted using the codes as shown
below.
~
Autome
communications
earths
sequence
prqm
FlS232C or
Rs-422
cable Computer
PC
ENDpmemsing.
BIN code
AJ71
'
CPU
ASCII code (ASCII code)
C24
.
.
Read
Write
Transmitted data
\
Trammitwd.ta
\
\
\
Transmitted data
-
~AnlC24mmeftsdatabetween
-
\
(1234~)
BIN code and
ASCII
code.)
Fig.
1.1
Data Transmission with the Dedicated Protocol
r
Rs232C
or
-22
cable
Sequence
program
CPU
mew'
TOFROM
inetwctions
PC
BUnW
C24
Oon
to
FFH
AJ71
.
.
External device
(such
as
a
computer, printer)
Oac
to
FFH
Transmit
Receive
T
I
(Data
is
transmitled
in unchanged
code
through
the
buffer
memory.)
Fig.
1.2.
Data Transmission in the No-Protocol Mode/Bldirectional Mode
I
1-1
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