B–6

Communications Protocol

Command – 00 The 00 command controls the Forward, Reverse and Stop mode of the inverter. You must set parameter A002=03 in order for serial communications control of the inverter to apply.

 

 

The frame format of command 00 follows the

Frame format

 

 

 

 

 

 

timing diagram and specification table.

 

 

 

 

 

 

 

 

 

 

 

STX

Node

 

Command

Data

BCC

[CR]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Element

Description

 

Size

 

 

Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STX

Control code (STart of TeXt)

 

1 byte

 

STX (0x02)

B

 

 

 

 

 

 

 

 

 

 

 

 

 

Node

Node (station) address of inverter

2 bytes

 

01 to 32, and FF (broadcast to all

Appendix

 

 

 

 

 

 

 

 

 

nodes)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Command

Transmission command

 

2 bytes

00

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Data

Transmission data

 

1 byte

00

= Stop command

 

 

 

 

 

 

 

01

= Forward command

 

 

 

 

 

 

 

02

= Reverse command

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BCC

Block check sum code

 

2 bytes

 

Exclusive OR of Node,

 

 

 

 

 

 

 

 

Command, and Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[CR]

Control code (carriage return)

 

1 byte

 

[CR] (0x0D)

 

 

 

 

 

 

 

 

 

 

 

 

 

The example below shows a transmission to the inverter at address Node 1 to rotate the motor in the forward direction.

(STX) 01 00 1 (BCC) [CR]

to ASCII

02 30 31 30 30 31 33 30 0D

 

Command – 01 The 01 command sets the output frequency for the standard profile. You must set parameter A002=03 in order for serial communications control of the inverter to apply.

The frame format of command 01 follows the

Frame format

timing diagram and specification table.

 

 

 

 

 

 

 

 

STX

Node

 

Command

Data

BCC

[CR]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Element

Description

 

Size

 

Value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

STX

Control code (STart of TeXt)

 

1 byte

 

STX (0x02)

 

 

 

 

 

 

 

 

 

 

Node

Node (station) address of inverter

2 bytes

 

01 to 32, and FF (broadcast to all

 

 

 

 

 

 

nodes)

 

 

 

 

 

 

 

 

 

 

Command

Transmission command

 

2 bytes

01

 

 

 

 

 

 

 

 

 

 

 

 

 

Data

Transmission data

 

6 bytes

 

ASCII code for ten times the

 

 

 

 

 

 

frequency (accommodates two

 

 

 

 

 

 

decimal places)

 

 

 

 

 

 

 

 

 

 

BCC

Block check sum code

 

2 bytes

 

Exclusive OR of Node,

 

 

 

 

 

 

Command, and Data

 

 

 

 

 

 

 

 

 

 

[CR]

Control code (carriage return)

 

1 byte

 

[CR] (0x0D)

 

 

 

 

 

 

 

 

 

 

The example below shows a transmission to the inverter at address Node 1 to set the output frequency for 5 Hz. We use a value of 500 in ASCII to represent 5.00 Hz.

(STX) 01 01 000500 (BCC) [CR]

to ASCII

02 30 31 30 31 30 30 30 35 30 30 30 35 0D