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4. SElTINGS AND PROCEDURES BEFORE OPERATION
MELSEC-A
(b) A computer and station 0 AJ71 C24 are connected through the US-422
port:
Terminal resistance
SW23 : OFF
SW23 : OFF
SW23
:
ON
setting required
SW24 : OFF
SW24
:
OFF
SW24 : ON
i a t i o n T
A171C24
I
! AJ71C24
SDA
I
fi--7
I
\
\
I
SOA
SDB
I
RDA
I
I
I
I
SDB
I
I
I
RDA
I
I
I
I
I
I
i
I
I
I
I
I
1
Dedicated
(Modes: 5 to
8 )
Dedicated
(Modes: 5 to
8 )
Dedicated
(Modes: 5 to
8 )
No-protocol (Modes: 1 to
4 )
No-protocol (Modes: 1 to 4)
No-~rotocol (Modes: 1 to
4)
m:n connection ratio
(a) The computer and the AJ71C24 are connected through the US-232C.
and the AJ71C24 modules are connected through the US-422.
.
,
SW23: OFF
SW24: OFF
I
AJ71C24
I
(RS-232C)
I
I
(
station
n
I
I
AJ71C24
I
(RS.232C)
I
i
Dedicated
( : z ; l n e. i
2s$2D2 )
Dedicated
(
Modes:
Main
:
A.
RS-422
8.
D
Modes: A. B, D
(Main
:
RS-422
)
(Modes:
5.6.8)
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