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4. OPERATION
4.6 Serial communication operation
The RS-422 or RS-232C communication function may be used to operate the servo amplifier from a
command device (controller) such as a personal computer. Note that the RS-422 and RS-232C
communication functions cannot be used at the same time.
This section provides a data transfer procedure. Refer to Chapter 15 for full information on the connection
and transferred data between the controller and servo amplifier.
4.6.1 Positioning operation in accordance with programs
By selecting the program No. and switching on the forward rotation start (ST1) using the communication
function, positioning operation in accordance with programs can be started.
(1) Selection of programs
Using the device forced output from the controller (command [9][2], data No. [6][0]), choose programs
from among No.1 to 16.
(2) Timing chart
Transmission
data
Servo motor
speed
Program No. 2
3ms
Program No. 1 Program No. 3
1) 4) 5) 2) 4) 5) 3) 4) 5)
5ms or more 5ms or more 5ms or more
No. Transmission data Command Data No.
1) Program No.2 selection [9] [2] [6] [0]
2) Program No.1 selection [9] [2] [6] [0]
3) Program No.3 selection [9] [2] [6] [0]
4) Forward rotation start (ST1) ON [9] [2] [6] [0]
5) Forward rotation start (ST1) OFF [9] [2] [6] [0]
4.6.2 Multidrop system
The RS-422 communication function can be used to operate several servo amplifiers on the same bus. In
this case, set the station numbers to the servo amplifiers to determine the destination servo amplifier of
the currently transmitted data. Use parameter No.15 to set the station numbers.
Always set one station number to one servo amplifier. Normal communication cannot be made if one
station number is set to two or more servo amplifiers. When using one command to operate several servo
amplifiers, use the group designation function described in Section 4.6.3.
CHARG E
MITSUBISHI
Controller
RS-422
For cable connection diagram,
refer to Section 8.1.1.
CHARG E
MITSUBISHI
CHARG E
MITSUBISHI
CHARG E
MITSUBISHI
To CN3
Axis 1
(Station 0)
Axis 2
(Station 1)
Axis 3
(Station 2)
To CN3 To CN3 To CN3
Axis 32
(Station 31)