Mitsubishi Electric FR-HC2-7.5K Instruction Manual page 108

(4) Data definitions
1) Control code
Signal
ASCII Code
Name
STX H02
ETX H03
ENQ H05
ACK H06
LF H0A
CR H0D
NAK H15
2) Station number
Specify the station number of the converter which communicates with the computer.
3) Instruction code
Specify the processing request, e.g. operation or monitoring, given by the computer to the converter. Hence, the
converter can be run and monitored in various ways by specifying the instruction code appropriately. (Refer to page
106)
4) Data
Indicates the data such as frequency and parameters transferred to and from the converter. The definitions and
ranges of set data are determined in accordance with the instruction codes. (Refer to page 106)
5) Waiting time
Specify the waiting time between the receipt of data at the converter from the computer and the transmission of reply
data. Set the waiting time in accordance with the response time of the computer in the range of 0 to 150ms in 10ms
increments. (Example; 1:10ms, 2:20ms)
Computer
Converter
Converter
Computer
REMARKS
 When Pr. 123 (waiting time setting)  9999, create the communication request data without "waiting time" in the data format. (The
number of characters decreases by 1.)
 The data check time varies by the instruction code. (Refer to page 102)
6) Sum check code
The sum check code is a 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits) of the sum (binary)
derived from the checked ASCII data.
(Example 1)
Computer Converter
ASCII Code
* When the Pr. 123 Waiting time setting
data without "waiting time" in the data format. (The number of characters decreases by 1.)
(Example 2)
Converter
Computer
ASCII Code
Description
Start Of Text (Start of data)
End Of Text (End of data)
Enquiry (Communication request)
Acknowledge (No data error detected)
Line Feed
Carriage Return
Negative Acknowledge (Data error detected)
Instruction
ENQ Station
code
number
0 1 E 1 1
H05 H30 H31 H45 H31 H31 H30 H37 H41 H44 H46 H34
H30+H31+H45+H31+H31+H30+H37+H41+H44
= H1F4
Sum
"9999", create the communication request
Data read
Station
STX
number
0 1 1 7 7
H02 H30 H31 H31 H37 H37 H30 H03 H33 H30
H30+H31+H31+H37+H37+H30
= H130
Sum
Description of parameters
Converter data processing time
= Waiting time
(setting 10ms)
Sum
check
Data
code
0 7 A D F 4
Binary code
Sum
ETX
check
code
0 3 0
Binary code
+ data check time
(About 10 to 30ms,
which depends on the
instruction code)
101
3