Mitsubishi Electric FR-A700 Technical Manual page 413

(4) Data definitions
1) Control codes
Signal ASCII
Name Code
STX H02 Start of Text (start of data)
ETX H03 End of Text (end of data)
ENQ H05 Enquiry (communication request)
ACK H06 Acknowledge (no data error detected)
LF H0A Line Feed
CR H0D Carriage Return
Negative Acknowledge (data error
NAK H15
detected)
2) Inverter station number
Specify the station number of the inverter which
communicates with the computer.
3) Instruction code
Specify the processing request, e.g. operation or
monitoring, given by the computer to the inverter.
Hence, the inverter can be run and monitored in
various ways by specifying the instruction code as
appropriate. (Refer to page 452)
4) Data
Indicates the data such as frequency and
parameters transferred to and from the inverter.
The definitions and ranges of set data are
determined in accordance with the instruction
codes. (Refer to page 452)
5) Waiting time
Specify the waiting time between the receipt of
data at the inverter from the computer and the
transmission of reply data. Set the waiting time in
accordance with the response time of the
computer between 0 and 150ms in 10ms
increments. (e.g. 1 = 10ms, 2 = 20ms).
When the [Pr. 123, Pr. 337 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 changes depending on the
instruction code. (Refer to page 448)
Computer
Inverter
Inverter
Computer
Inverter data processing time
= Waiting time
(setting 10ms)
Description
+ data check time
(About 10 to 30ms,
which depends on the
instruction code)
6) Sum check code
The sum
(hexadecimal) representing the lower 1 byte (8
bits) of the sum (binary) derived from the checked
ASCII data.
[Example 1] Computer
ENQ Station
Binary code
number
0
ASCII Code H05 H30 H31
H30
= H1F4
Sum
* When the [Pr. 123, 337 Waiting time setting
communication request data without waiting time in the data
format.
[Example 2] Computer
Station
STX
number
Binary code
0
H02 H30 H31
ASCII Code
H30
= H130
Sum
447
PARAMETER
check code is 2-digit
inverter
Instruction
check
Data
code
code
1 E 1 1 0 7 A D F
H45 H31 H31 H30 H37 H41 H44 H46 H34
+ H31 H45 H31 + + + + H30 + H37 H41 H44 + +
9999], create the
inverter
Sum
Data read
ETX
check
code
1 1 7 7 0 3 0
H31 H37 H37 H30 H03 H33 H30
H31 H37 H37 H30
+ + + + +
ASCII
Sum
4
2