CHAPTER 13 RS-485 COMMUNICATIONS

13

Data1 (=A5h)

Data2 (=02h)

OUT13

1 (ON)

0

OUT12

0 (OFF)

0

OUT11

1 (ON)

0

OUT10

0 (OFF)

0

OUT9

0 (OFF)

0

OUT8

1 (ON)

0

OUT7

0 (OFF)

OUT15

1 (ON)

OUT6

1 (ON)

OUT14

0 (OFF)

 FC 05h (Write in single coil data)

(1) Query from the master

Station No.

FC

1 byte

1 byte

Information

Address

Coil data

2 bytes

2 bytes

CRC check

16 bits

(2 bytes)

･･･ 05h

(H) ･･･ Specify the coil address.

(L)

* For the addresses, refer to the table 13-4.

(H) ･･･ Specify 000h for OFF and FF00h for ON.

(L)

(L)

(H)

(2) Response message form the amplifier

Station No.

FC

Information

Address

Coil data

CRC check

1 byte

1 byte

2 bytes

(H)

(L)

2 bytes

(H)

(L)

16 bits (L)

(2 bytes) (H)

･･･ 05h

･･･ Specified address.

･･･ Specified data.

(3) Message examples

Shows a message example to write in ON to OUT9 signal.

<Query example>

Station No.

FC

1 byte

1 byte

Information

Address

No. of coil data

2 bytes

2 bytes

CRC check

16 bits

(2 bytes)

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

05

02 ･･･ Specify 0208h as the CONT9 signal address.

08

FF ･･･ Specify ON = FF00h.

00

0C

40

13-10 Modbus RTU Communications