Table of Contents
Advertisement
Specify the delay time (time period between the time when the converter unit receives data from the computer and the time
when the converter unit starts transmission of reply data). Set the time delay 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)
When Pr.123 PU communication waiting time setting or Pr.337 RS-485 communication waiting time setting is set
to other than "9999", create the communication request data without "delay time" in the data format. (The number of
characters decreases by 1.)
Computer
Converter unit
Converter unit
Computer
*1
When Pr.123 = "9999", the waiting time is the data setting value × 10 ms. When Pr.123 ≠ "9999", the waiting time is the value set in Pr.123.
*2
The time is about 10 to 30 ms. It varies depending on the instruction code.
NOTE
• The data check time varies depending on the instruction code. (Refer to
• Sum check code
The sum check code is a 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits) of the sum derived from the
checked ASCII data.
(Example 1)
Computer
Converter unit
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)
Converter unit
Computer
ASCII Code
• Error code
If any error is found in the data received by the converter unit, its error definition is sent back to the computer together with
the NAK code.
Error code
H0
Computer NAK error
H1
Parity error
H2
Sum check error
H3
Protocol error
H4
Framing error
H5
Overrun error
H6
—
112
5. PARAMETERS
5.7 (N) Communication operation parameters
Instruction
Station
ENQ
code
number
0
1
E
1
H05
H30 H31
H45 H31
H30+H31+H45+H31+H31+H30+H37+H41+H44
= H1F4
Sum
"9999", create the communication request
Data read
Station
STX
number
0
1
1
7
H02
H30 H31
H31 H37
H30+H31+H31+H37+H37+H30
= H130
Sum
Error item
The number of errors consecutively detected in
communication request data from the computer is greater
than the permissible number of retries.
The parity check result does not match the specified parity.
The sum check code in the computer does not match that of
the data received by the converter unit.
The data received by the converter unit has a grammatical
mistake. Or, data receive is not completed within the
predetermined time. CR or LF is not as set in the parameter.
The stop bit length differs from the initial setting.
New data has been sent by the computer before the converter
unit completes receiving the preceding data.
—
Converter unit data processing time
= Waiting time ∗1 + Data check time ∗2
Sum
Data
check
code
1
0
7
A
D
F
H31
H30 H37 H41 H44 H46 H34
Sum
ETX
check
code
7
0
3
0
Binary code
H37
H30 H03 H33 H30
Error description
page
113.)
4
Binary code
Converter unit operation
The inverter output is shut off
(E.PUE/E.SER) if error occurs
continuously more than the
permissible number of retries.
—
Advertisement
Table of Contents
