Hitachi L300P - Manual (Page 234)

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 02 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