Communication Specifications; Parameter Setting - Mitsubishi Electric MELSERVO-J2 Series Instruction Manual

8. COMMUNICATION FUNCTIONS

8.2 Communication specifications

This servo amplifier is designed to send a reply on receipt of an instruction. The device which gives this
instruction (e.g. personal computer) is called a master station and the device which sends a reply in
response to the instruction (servo amplifier) is called a slave station. When fetching data successively, the
master station repeatedly commands the slave station to send data.
Item
Baudrate
Transfer code
Transfer protocol Character system, half-duplex communication system

8.2.1 Parameter setting

When the RS-422/RS-232C communication function is used to operate the servo, choose the communica-
tion specifications with parameter No.16.
After setting the values of these parameters, they are made valid by switching power off once, then on
again.
(1) Communication baudrate
Choose the communication speed. Match this value to the communication speed of the sending end
(master station).
Parameter No. 16
(2) Checksum
The checksum added to data can be deleted. When the checksum is not needed for the communication
specifications of the master station, delete the checksum with this parameter.
Parameter No. 16
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4800/9600/19200 asynchronous system
Start bit : 1 bit
Data bit : 8 bits
Parity bit : 1 bit (even)
Stop bit : 1 bit
(LSB)
0 1 2
Start
Communication baudrate
0: 9600[bps]
1:19200[bps]
2: 4800[bps]
Checksum
0: Yes (checksum added)
1: No (checksum not added)
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Description
(MSB)
3 4 5 6
Data
1 frame (11 bits)
8 - 3
Next
Stop
7 Parity
start