Cleveland Range inverter manual MODBUS-RTUCommunication, Request for Write, Acknowledge Response

Chapter 5 - MODBUS-RTU Communication

Request for Write

The number of

ENQ

Drive No.

CMD

Address

address to

Data

SUM

EOT

write

05h

“01” ~ “1F”

“W”

“XXXX”

“1” ~ “8” = n

“XXXX…”

“XX”

04h

1 byte

2 bytes

1 byte

4 bytes

1 byte

n * 4 bytes

2

1

Total byte = 12 + n * 4 = max. 44 bytes

Acknowledge Response

ACK

Drive No.

CMD

Data

SUM

EOT

06h

“01” ~ “1F”

“W”

“XXXX…”

“XX”

04h

1 byte

2 bytes

1 byte

n * 4 bytes

2 bytes

1 byte

Total byte = 7 + n * 4 = max. 39 bytes

Negative Acknowledge Response

NAK

Drive No.

CMD

Error Code

SUM

EOT

15h

“01” ~ “1F”

“W”

“**”

“XX”

04h

1 byte

2 bytes

1 byte

2 bytes

2 bytes

1 byte

Total byte = 9 bytes

Note) As for Run and Frequency command, when Request for Write and Acknowledge Response is exchanged

between pc and inverter for the first time, previous data is returned. In this case, Request for Write Twice.

From the second time of transmission, the exactly same data will be transmitted.

Request for Monitor Registration: This is useful when constant parameter monitoring and data updates are required.

Request for Registration of ‘n’ numbers of Address

				The number
ENQ	Drive No.		CMD	of address	Address		SUM	EOT
				to monitor
05h	“01” ~		“X”	“1” ~	“XXXX…”		“XX”	04h
1 byte	2 bytes		1 byte	1 byte		n * 4	2 bytes	1 byte
Total byte = 8 + n * 4 = max. 40 bytes
Acknowledge Response
ACK		Drive No.		CMD		SUM		EOT
06h		“01” ~ “1F”		“X”		“XX”		04h
1 byte		2 bytes		1 byte		2 bytes		1 byte

Total byte = 7 bytes

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