6
-80
•
RS-422A
(4-wire)
Fig 6.57 RS-422A Wiring
n
Message
Format
In
RS-422A/485 communications, the master sends commands to the slave, and the slave responds. The mes-
sage
format is configured for both sending and receiving as shown below, and the length of data packets is
changed
by the command (function) contents.
The
space between messages must support the following.
Fig 6.58 Message Spacing
SDA
SDB
RDA
RDB
FG
1
2
6
8
S
S
R
R
S
S
R
R
SDA
SDB
RDA
RDB
SG
9
5
6
1
3
FG
7
9
5
6
1
3
7
SDA
SDB
RDA
RDB
SG
FG
SDA SDB RDA RDB SG
9
5
6
1
3
FG
7
RS-422A
RS-422A
RS-422A
RS-422A
interface
Shielded cable
Code
Pin No.
B500-AL001 Link Adapter
Shielded cable
RS-422A/485
interface
Communications Board
9-pin D-sub connector
(Connector on cable: Male)
Code
Pin No.
Hood
Shielded cable
Code
Control cir-
cuit terminal
block (com-
munictions
terminals)
Code
SYSDRIVE RV
SYSDRIVE RV
Control cir-
cuit terminal
block (com-
munictions
terminals)
Code
Pin No.
Code
Pin No.
Note Turn ON the terminating resistance switch at all Inverters.
Message data
(Request message or response
Slave address
(1 byte)
Function code
(1 byte)
Communications
data
Error check
(2 bytes)
Command message
Response message
Command message
PLC to Inverter
PLC to Inverter
Inverter to PLC
Time (Seconds)
24 bits long
H5-06
setting
24 bits long
5 ms min.
Summary of Contents for SYSDRIVE 3G3RV
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