FL20-S Series
324
X Communication
10.1 Communication
Servo drive provides RS485 communication. The description below shows the communication wiring and
communication protocol.
10.1.1 MODBUS General
Modbus is a serial and asynchronous communication protocol. Modbus protocol is a general language applied
to PLC and other controlling units. This protocol has defined an information structure which can be identified
and used by a controlling unit regardless of whatever network they are transmitted.
You can read reference books or ask for the details of MODBUS from Parker..
Modbus protocol does not require a special interface while a typical physical interface is RS485.
10.1.2 MODBUS Protocol
1 Transmission mode
(1) ASCII mode
In ASCII mode, one Byte (hexadecimal format) is expressed by two ASCII characters.
For example, 31H (hexadecimal data) includes two ASCII characters’3(33H)’,’1(31H)’.
Common characters, ASCII characters are shown in the following table:
Characters
‘0’
‘1’
‘2’
‘3’
‘4’
‘5’
‘6’
‘7’
ASCII Code
30H
31H
32H
33H
34H
35H
36H
37H
Characters
‘8’
‘9’
‘A’
‘B’
‘C’
‘D’
‘E’
‘F’
ASCII Code
38H
39H
41H
42H
43H
44H
45H
46H
(2) RTU mode
In RTU mode, one Byte is expressed by hexadecimal format. For example, 31H is delivered to data packet.
2 Baud rate
Setting range: 2400, 4800, 9600, 19200, 38400, 57600
3 Frame structure:
(1) ASCII mode
Byte
Function
1
7
0/1
1/2
Start Bit (Low Level)
Data Bit
Parity Check Bit (None for this bit in case of no checking. Otherwise 1 bit)
Stop Bit (1 bit in case of checking, otherwise 2 bits)
(2) RTU mode
Byte
Function
1
8
0/1
1/2
Start Bit (Low Level)
Data Bit
Parity Check Bit (None for this bit in case of no checking. Otherwise 1 bit)
Stop Bit (1 bit in case of checking, otherwise 2 bits)
4 Error Check
(1) ASCII mode
Longitudinal Redundancy Check (LRC): It is performed on the ASCII message field contents excluding the
‘colon’ character that begins the message, and excluding the CRLF pair at the end of the message.
Summary of Contents for FL20-S Series
Page 1: ......
Page 33: ...FL20 S Series 33 M3 structure Fig 3 1 5 Servo drive structure 3 ...
Page 35: ...FL20 S Series 35 M4 structure Approx mass 10 365 kg Fig 3 1 7 Servo drive structure 5 ...
Page 36: ...FL20 S Series 36 M5 structure Approx msaa 11 1Kg Fig 3 1 8 Servo drive structure 6 ...
Page 37: ...FL20 S Series 37 M6 structure Approx mass 17 4Kg Fig 3 1 9 Servo drive structure 7 ...
Page 169: ...FL20 S Series 169 Fig 6 4 44FL20E Cam internal frameworkdiagram ...
Page 347: ...FL20 S Series 347 ...
