Communications Protocol
Append
ix
B
B–8
The arrangement of the terminal assignment data permits you to assign all inputs in a single
command. The example below shows a transmission to the inverter at address Node 1 to set the
Forward command, Multi-speed 1 and Multi-speed 2.
Command – 03
The 03 command reads the monitor data as a single block.
The frame format of command 03 follows the
diagram and specification table. The transmit
frame has no data field.
The receive frame has a 104-byte data field,
containing values for 13 items.
(STX) | 01 | 02 | 0x000000000000000D | (BCC) | (CR)
to ASCII
02 | 30 31 | 30 31 | 30 30 30 30 30 30 30 30 30 30 30 30 30 30 30 68 | 30 35 | 0D
0x0000000000000001
+ 0x0000000000000004
+ 0x0000000000000008
= 0x000000000000000D
Sum the three data strings:
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
Command
Transmission command
2 bytes 03
BCC
Block check sum code
2 bytes Exclusive OR of Node,
Command, and Data
[CR]
Control code (carriage return)
1 byte
[CR] (0x0D)
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
Data
Transmission data
104
bytes
(see next table)
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
BCC [CR]
Transmit frame format
STX Node
Data
BCC [CR]
Receive frame format
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