Mitsubishi Electric FR-D700 Instruction Manual page 190

Communication operation and setting
(4) Data definitions
1) Control code
Signal ASCII Code
STX
ETX
ENQ
ACK
LF
CR
NAK
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 52)
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 52)
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).
Computer
Inverter
Inverter
Computer
REMARKS
When the Pr. 123 PU communication waiting time setting setting is other than 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 187)
6) Sum check code
The sum check code is 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits) of the sum (binary) derived
from the checked ASCII data.
(Example 1)
Computer
ASCII Code
∗
When the Pr. 123 Waiting time setting
data without "waiting time" in the data format. (The number of characters decreases by 1.)
(Example 2)
Inverter
ASCII Code
186
H02 Start of Text (Start of data)
H03 End of Text (End of data)
H05 Enquiry (Communication request)
H06 Acknowledge (No data error detected)
H0A Line Feed
H0D Carriage Return
H15 Negative Acknowledge (Data error detected)
Station
ENQ
Inverter
number
0 1
H05 H30 H31
H30+H31+H45+H31+H31+H30+H37+H41+H44
=H1F4
Sum
=
Station
STX
Computer number
0 1
H02 H30 H31
H30+H31+H31+H37+H37+H30
= H130
Sum
Description
Inverter data processing time
= Waiting time
(Setting 10ms)
Instruction
Data
code
E 1 1 0 7 A
H45 H31 H31 H30 H37 H41 H44 H46 H34
"9999", create the communication request
Sum
ETX
check
Data read
code
1 7 7 0 3
H31 H37 H37 H30 H03 H33 H30
+ Data check time
(About 10 to 30ms, which
depends on the instruction code)
Sum
check
code
D F 4
Binary code
0
Binary code