ASCII Mode Communications
Append
ix
B
B–6
The example below shows a transmission to the inverter at address Node 1 to rotate the motor
in the forward direction.
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
timing diagram and specification table.
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.
When using the data as the feedback (process variable) for PID control, set the most significant
byte to ASCII “1.” The following example transmits the data “5%.”
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 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)
(STX) | 01 | 00 | 1 | (BCC) | [CR]
to ASCII
02 | 30 31 | 30 30 | 31 | 33 30 | 0D
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)
STX Node
Command
Data
BCC [CR]
Frame format
(STX) | 01 | 01 | 000500 | (BCC) | [CR]
to ASCII
02 | 30 31 | 30 31 | 30 30 30 35 30 30 | 30 35 | 0D
(STX) | 01 | 01 | 000500 | (BCC) | [CR]
to ASCII
02 | 30 31 | 30 31 | 31 30 30 35 30 30 | 30 35 | 0D
