Mitsubishi Electric FR-E700 Instruction Manual page 404

Communication operation and setting
Data definitions
● Control codes
Signal Name
ENQ
ACK
NAK
Tab. 6-74: Control codes
● Inverter station number
Specify the station number of the inverter which communicates with the computer.
The inverter station numbers are specified between H00 and H1F (stations 0 to 31) in hexadecimal.
● 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 instruc-
tion code as appropriate. (Refer to the appendix.)
● 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 the appendix.)
● 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 150 ms in 10 ms increments (e.g. 1 = 10 ms, 2 = 20 ms).
Fig. 6-126: Specifying the waiting time
NOTES
When Pr. 123 "Waiting time setting" 9999, create the communication request data without "wait-
ing 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 6-253).
6 - 250
ASCII Code
STX H02
ETX H03
H05
H06
LF H0A
CR H0D
H15
Computer
Data flow
Inverter
Inverter
Data flow
Computer
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)
Inverter data processing time
= Waiting time
(setting 10 ms)
Parameter
+ Data check time
(About 10 to 30 ms which
depends on the instruction
codes)
I000038C