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Computer Link Operation Setting
3
INVERTER FUNCTIONS
(4) Data definitions
1) Control codes
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, 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 87.)
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 184.)
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).
REMARKS
•The inverter station numbers may be set between H00 and H1F (stations 0 and 31) in
hexadecimal.
•*3 indicates the control code.
•*4 indicates the CR or LF code.
When data is transmitted from the computer to the inverter, codes CR (carriage return)
and LF (line feed) are automatically set at the end of a data group on some computers.
In this case, setting must also be made on the inverter according to the computer.
Also, the presence and absence of the CR and LF codes can be selected using Pr. 341.
•At *5, when Pr. 337 "waiting time setting" is other than "9999", create the communication
request data without "waiting time" in the data format. (The number of characters is
decremented by 1.)
Signal 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)
REMARKS
When Pr. 337 "waiting time setting" ≠ "9999", create the communication request data
without "waiting time" in the data format. (The number of characters is decremented by 1.)
Computer
Inverter
Inverter
Computer
Inverter data processing time
= waiting time + data check time
(setting 10ms)
(12ms)