Mitsubishi Electric 800 Series Instruction Manual page 134

c. Reply data from the inverter to the computer (Data error detected)
Number of characters
Format
1
Inverter station
*1
D
NAK
number
e. Transmission data from the computer to the inverter when reading data
Number of characters
Format
1
Inverter station
C (No data error
*1
ACK
detected)
number
Inverter station
F (Data error
*1
NAK
detected)
number
*1 Indicates a control code.
*2 The inverter station number is specified in hexadecimal in the range of H00 to H1F (stations No. 0 to 31).
*3 Set the delay time. When Pr.123 PU communication waiting time setting is set to other than "9999", create the communication request data
without "delay time" in the data format. (The number of characters decreases by 1.)
*4 CR+LF code: When a computer transmits data to the inverter, some computers automatically provide either one or both of the codes CR (carriage
return) and LF (line feed) at the end of a data group. In this case, the same setting is required for data sent from the inverter to the computer. Use
Pr.124 PU communication CR/LF selection for the CR+LF code setting.
 Data definitions
• Control code
Signal name
STX
ETX
ENQ
ACK
LF
CR
NAK
• Inverter station number
Specify the station number of the inverter which communicates with the computer.
• Instruction code
Specify the processing request, for example, operation or monitoring, given by the computer to the inverter. Therefore, the
operation or monitoring an item is enabled by specifying the corresponding instruction code. (Refer to
• 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
• Time delay
Specify the delay time (time period between the time when the inverter receives data from the computer and the time when
the inverter starts transmission of reply data). Set the delay time in accordance with the response time of the computer in
the range of 0 to 150 ms in 10 ms increments. (For example, "1" for 10 ms or "2" for 20 ms.)
When Pr.123 PU communication waiting time setting is set to other than "9999", create the communication request data
without "delay time" in the data format. (The number of characters decreases by 1.)
Computer
Inverter
Inverter
Computer
*1 When Pr.123 = "9999", the waiting time is the data setting value × 10 ms. When Pr.123 ≠ "9999", the waiting time is the value set in Pr.123.
*2 About 10 to 30 ms. It varies depending on the instruction code.
NOTE
• The data check time varies depending on the instruction code. (Refer to
2 3 4 5
Error
*4
*2
code
2 3 4
*4
*2
*4
*2
ASCII code
H02
H03
H05
H06
H0A
H0D
H15
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)
page 137.)
Inverter data processing time
= Waiting time*1
page 135.)
3.4 Mitsubishi inverter protocol (computer link communication)
page 137.)
+ data check time*2
3. RS-485 Communication
1
2
3
4
5
6
7
8
9
10
133