Mitsubishi Electric FR-D720S SC EC, Instruction Manual

Page: 359 / 512

Parameter Communication operation and settings
FR-D700 SC EC 6 - 209
Data definitions
●
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
instruction 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 150ms in 10ms increments (e.g. 1 = 10ms, 2 = 20ms).
Signal Name ASCII Code Description
STX H02 Start Of Text (start of data)
ETX H03 End Of Text (end of data)
ENQ H05 Enquiry (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. 6-53: Control codes
I000038C
Fig. 6-110: Specifying the waiting time
NOTES
When Pr. 123 "Waiting time setting"
≠
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 6-212).
Computer
⇓
Data flow
Inverter
Inverter
⇓
Data flow
Computer
Inverter data processing time
= Waiting time
+ Data check time
(setting
×
10ms) (About 10 to 30ms which
depends on the instruction
codes)