7-22
External scale RS485 communication procedure
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
3Dh transmission
*
2
*
1
*
1
*
3
C2h transmission
80h reception
05h reception
80h transmission
04h transmission
81h reception
04h reception
06h reception
2. Absolute system
Transferring external scale 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 3Dh
2 82h 02h 3Ch
3 83h 03h 3Bh
4 84h 04h 3Ah
5 85h 05h 39h
6 86h 06h 38h
7 87h 07h 37h
8 88h 08h 36h
9 89h 09h 35h
10 8Ah 0Ah 34h
11 8Bh 0Bh 33h
12 8Ch 0Ch 32h
13 8Dh 0Dh 31h
14 8Eh 0Eh 30h
15 8Fh 0Fh 2Fh
16 90h 10h 2Eh
17 91h 11h 2Dh
18 92h 12h 2Ch
19 93h 13h 2Bh
20 94h 14h 2Ah
21 95h 15h 29h
22 96h 16h 28h
23 97h 17h 27h
24 98h 18h 26h
25 99h 19h 25h
26 9Ah 1Ah 24h
27 9Bh 1Bh 23h
28 9Ch 1Ch 22h
29 9Dh 1Dh 21h
30 9Eh 1Eh 20h
31 9Fh 1Fh 1Fh
Check sum becomes OK'ed when the lower 8-bit of the
sum of the received absolute data (15 characters) is 0.
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 conrm the absolute data coincide, in order to avoid
mis-operation due to unexpected noise.
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