Mitsubishi Electric FR-A820-00046 (0.4K), Instruction Manual

Page: 843 / 1218

Parameters (N) Operation via communication and its settings
FR-A800 5 - 641
Data definitions
●
Control code
●
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. Hence, the inverter can be run and monitored in various ways by specifying the
instruction code appropriately. (Refer to page 5-648.)
●
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 5-648.)
●
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 in the range of 0 to 150 ms in 10 ms increments. (For example; 1=10 ms, 2= 20 ms)
Signal name ASCII Code Description
STX H02 Start Of Text (Start of data)
ETX H03 End Of Text (End of data)
ENQ H05 Inquiry (Communication request)
ACK H06 Acknowledge (No data error detected)
LF H0A Line Feed
CR H0D Carriage Return
NAK H15 Negative Acknowledge (Data error detected)
Tab. 5-277: Control codes
I002736E
Fig. 5-318: Specifying the waiting time
NOTES When Pr. 123 or Pr. 337 (Waiting time setting) ≠ "9999", create a communication request data
without "waiting time" in the data format. (The number of characters decreases by 1.)
The data check time varies depending on the instruction code. (Refer to page 5-643.)
= +
Computer
Computer
Inverter
Inverter
Inverter data processing time
Waiting time
(setting x 10 ms)
data check time
(About 10 to 30ms,
which depends on the
instruction code)
Inverter data processing time