Mitsubishi Electronics 520 540 Air Conditioner User Manual


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146
Communication parameters
(3) Data format
Data communication between the computer and inverter is made in ASCII code
(hexadecimal code).
Data format types
1) Communication request data from computer to inverter
2) Reply data from inverter to computer during data write
3) Reply data from inverter to computer during data read
REMARKS
*1. Setting any of "0.1" to "999" in Pr. 37 "speed display" and "1" in instruction code "HFF" sets
the data format to A" or E" (6-digit data). Also, the output frequency turns to a speed
display, which is valid in 0.01r/min increments. (The third decimal place is invalid.) If the
instruction code "HFF" is other than "1", the display is in 1r/min increments and a 4-digit
data format can be used. Reply data is given in format E if the requested monitor data has
4 digits, in format E' if the data has 2 digits, or in format E" if the data has 6 digits.
*2. The data format to read/write Pr. 37 "speed display" is always E"/A" (6-digit data).
123456789101112131415
Format A
Format A'
Format A"
[Data write]
[Data read]
Format B
Number of
characters
Number of characters
*1
ENQ
*2
Inverter
station
number
Instruction
code
Data *4
Number
of
characters
Sum
check
Number of characters
1234567891011
*1
ENQ
*2
Inverter
station
number
Instruction
code
Data *4
Sum
check
12345678910111213
*1
ENQ
*2
Inverter
station
number
Instruction
code
Data *4
Sum
check
123456789
*1
ENQ
*2
Inverter
station
number
Instruction
code
*4
Sum
check
*3
Waiting
time
*3
Waiting
time
*3
Waiting
time
*3
Waiting
time
Error
code
*2
Inverter
station
number
*1
ACK
*4
Number
of
characters
Format C
*2
Inverter
station
number
Number
of
characters
*1
NAK
*4
Format D
[No data error detected]
[Data error detected]
1234
12345
Format E''
Format E'
*1
ETX
Number
of
characters
Format F
*1
STX
[Data error detected][No data error detected]
Read
data
Number of
characters
12345678910111213
*2
Inverter
station
number
*4
Sum
check
Format E
*1
STX
*1
ETX
Read
data
1234567891011
*2
Inverter
station
number
*4
Sum
check
Error
code
*2
Inverter
station
number
*1
NAK
*4
12345
*1
STX
*1
ETX
Read
data
123456789
*2
Inverter
station
number
*4
Sum
check
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