Communication Specifications; Outline Of Communication Specifications; Setting Servo Parameters - Mitsubishi Electric MELSERVO-J5 Series User Manual

8.2

Communication specifications

Outline of communication specifications

The servo amplifier returns data upon receipt of a command. The device that gives the command (such as a personal
computer) is a master station, and the device (servo amplifier) that returns data in response to the command is a slave station.
When fetching data successively, give commands to the slave station from the master station repeatedly so that the slave
station sends data.
Item
Baud rate [bps]
Transfer code
Transfer method
(LSB)
Start 0 1

Setting servo parameters

When the RS-422 communication function is used to operate the servo, set the communication specifications of the servo
amplifier with servo parameters.
The settings of the servo parameters are enabled after the power is cycled.
Serial communication baud rate
Select a communication speed with [Pr. PC21.1 RS-422 communication - Baud rate selection]. Match this value to the
communication speed of the sending side (master station).
Servo parameter
PC21.1
RS-422 communication response delay time
Set the time from when the servo amplifier (slave station) receives communication data until when it returns data. Setting [Pr.
PC21.2 RS-422 communication - Response delay time selection] to "1" (enabled) will return data in 800 μs or longer.
Servo parameter
PC21.2
Setting station numbers
Set the station No. of the servo amplifier in [Pr. PC20 Station No. setting]. The setting range is 0 to 31.
Description
9600/19200/38400/57600/115200 asynchronous system
Start bit
Data bit
Parity bit
Stop bit
Character method
2 3 4 5
Data
1 frame (11 bits)
Description
RS-422 communication - Baud rate selection
0: 9600 [bps] (initial value)
1: 19200 [bps]
2: 38400 [bps]
3: 57600 [bps]
4: 115200 [bps]
Description
RS-422 communication - Response delay time selection
0: Disabled (initial value)
1: Enabled
Setting "1" will return data with a delay of 800 μs or longer.
8 COMMUNICATION FUNCTION (MITSUBISHI ELECTRIC AC SERVO PROTOCOL) [A]
1 bit
8 bits
1 bit (even number)
1 bit
Half-duplex communication method
(MSB)
Next
start
6 7 Parity Stop
8.2 Communication specifications
8
399