CHAPTER 13 RS-485 COMMUNICATIONS

13

(3) Message examples

Shows a message example to write in immediate speed, immediate acceleration time and

communication CONT signal, and read out feedback speed, effective torque, and motor current.

The write in start address is 6000H, and the read out start address is 6008H.

First, set parameter Nos. for the free assignment of addresses for parameters PA3_41 to PA3_44.

After setting, reboot to enable the settings.

PA3_41: 007993292

PA3_42: 00000000 (default)

PA3_43: 00040500

PA3_44: Set 00000000 (default)

<Query example>

Station No.

1 byte 01 ・ When the amplifier station no. is "1".

FC

1 byte 17

Read out start

address

2 bytes

60

08

･･･ Specify the read out first address.

No. of registers 2 bytes

00

06

･･･ Specify 0006h as the number of data 3×2.

Write in start

address

2 bytes

60 ･･･ Specify the write in first address.

00

No. of registers 2 bytes

00

06

･･･ Specify 0006h as the number of data 3×2.

No. of data bytes 1 byte 0C ･･･ Specify 3×4 = 0Ch.

00 ･･･ Specify immediate speed: 186A0h (1000

Information

Data 1

4 byte

01

86

r/min).

A0

00 ･･･ Specify immediate acceleration time: 3E8h

Data 2

4 byte

00

03

(100 ms).

E8

00 ･･･ Specify communication CONT signal: servo

Data 3

4 byte

00

00

ON and FWD.

03

CRC check

16 bits CC

(2 bytes) 17

13-14 Modbus RTU Communications