Fuji Electric ALPHA5 Smart, User Manual

Page: 503 / 636

CHAPTER 13 RS-485 COMMUNICATIONS
Modbus RTU Communications
13-15
13
<Response message example>
Station No. 1byte 01
FC 1byte 17
No. of data bytes 1byte 0C
00
･･･
Feedback speed: 1000 [r/min] (3E8h)
00
03
Data 1 4byte
E8
00 ･･･ Effective torque: 80 [%] (50h)
00
00
Data 2 4byte
50
00
･･･
Motor current: 80 [%] (50h)
00
00
Information
Data 3 4byte
50
19
CRC check
16 bits
(2 bytes)
5F
 FC 08h (Echo back maintenance )
(1) Query from the master
Station No. 1 byte
FC 1 byte ･･･
08h
(H)
Sub code 2 bytes
(L)
･･･
Specify 0000h as the sub code of echo back.
(H)
Information
Data 2 bytes
(L)
･･･
Specify an arbitrary data.
(L)
CRC check
16 bits
(2 bytes) (H)
(2) Response message from the amplifier
Station No. 1 byte
FC 1 byte ･･･
08h
(H)
Sub code 2 bytes
(L)
･･･
0000h
(H)
Information
Data
2 bytes
(L)
･･･
Echo back the specified data.
(L)
CRC check
16 bits
(2 bytes)
(H)