7-18
RS485 Communication Protocol
Refer to the instruction manual of the host for the transmission/reception method of com-
mand. Following shows the communication example of the driver to Pr5.31 “Axis address
= 1”.
Reception of
absolute data
(15 characters)
N
N
N
N
Y
Y
Y
Y
Host requests
for absolute
data to driver
Host receives
absolute data
from driver
Transmission starts
transmission finishes
06h transmission
15h transmission
Check sum
OK'ed reception
01h transmission
00h transmission
81h transmission
05h transmission
2Dh transmission
*
2
*1
*
1
*
3
D2h transmission
80h reception
05h reception
80h transmission
04h transmission
81h reception
04h reception
06h reception
Command from the host will be transmitted to the desired driver based on RS485 trans-
mission protocol. For details of communication, refer to P.7-27, "Communication".
Caution
• Allow 50 ms or longer interval for axis switching when you want to
capture multiple axes data.
• It is recommended for you to repeat the above communication more
than 2 times to confirm the absolute data coincide, in order to avoid
mis-operation due to unexpected noise.
2. Absolute system
Transferring absolute data
Data of *1, *2 and *3 are determined by the setup of
Pr5.31 “Axis address”.
Axis
address
(example)
Data of
*
1
Data of
*
2
Data of
*
3
0
not usable with RS485 communication
1
81h
01h
2Dh
2
82h
02h
2Ch
3
83h
03h
2Bh
4
84h
04h
2Ah
5
85h
05h
29h
6
86h
06h
28h
7
87h
07h
27h
8
88h
08h
26h
9
89h
09h
25h
10
8Ah
0Ah
24h
11
8Bh
0Bh
23h
12
8Ch
0Ch
22h
13
8Dh
0Dh
21h
14
8Eh
0Eh
20h
15
8Fh
0Fh
1Fh
16
90h
10h
1Eh
17
91h
11h
1Dh
18
92h
12h
1Ch
19
93h
13h
1Bh
20
94h
14h
1Ah
21
95h
15h
19h
22
96h
16h
18h
23
97h
17h
17h
24
98h
18h
16h
25
99h
19h
15h
26
9Ah
1Ah
14h
27
9Bh
1Bh
13h
28
9Ch
1Ch
12h
29
9Dh
1Dh
11h
30
9Eh
1Eh
10h
31
9Fh
1Fh
0Fh
Check sum becomes OK'ed when the lower 8-bit of the
sum of the received absolute data (15 characters) is 0.
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