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3. SPECIFICATIONS
MELSEC-A
3.2.2
RS-232C connector specifications
The specifications of the
AS-232C
connector are as described in the corre-
sponding section in the
AJ71C2438
User's Manual.
3.2.3
RS-422!485 interface specifications
(1)
Fig.
3.1
shows the specifications of the
RS-4221485
interface for
connection with the computer or
AJ71 UC24.
SDA
SDB
RDA
RDB
Signal
Signal Direction
AbEp
AJ71UC24
ct
Computer
Description
I
I
SDA
1
(send data
1
Fig. 3.1 RS-4221485 Interface
SDB
RDA
RDB
SG
FG
NC
(2)
Fig.
3.2
shows the functional block diagram of the
RS-4221485
inter-
Send data
Receive data
Receive data
Signal ground
Frame ground
Free
face.
I
Fig. 3.2 RS-422/485 Interface Functional Block Diagram
3.2.4
RS-422 cable specifications
The specifications of the
RS-422
cable are as shown in the corresponding
section in the
AJ71C24-S8
User's Manual.
4
3 - 3
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