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8 PARAMETER FUNCTIONS
8-20
4) Sumcheck
As a sumcheck value, set the lower 1 byte (8 bits) of the sum derived from
ASCII data (station number, instruction code, waiting time, data code)
except the control code. The communication data is converted into ASCII
automatically.
ENQ
0 1 E 1 1 0 7 A D F 4
(H05) H30 H31 H45 H31 H31
H30 H37 H41 H44
(H46 H34)
Sumcheck
Data
Binary code
ASCII code
Station
Number
Instruction
Code
Waiting
Time
Data Code
Sumcheck value calculation: H30+31+45+31+31+30+37+41+44=H1F4
5) Error codes
When the data received by the drive unit is in error, the error code is
returned to the computer. The definitions of the error codes are as follows.
Error Code Error Item Error Definition Drive Unit Operation
H0
Computer
NAK error
The number of errors
consecutively detected in
communication request data from
the computer is greater than the
permissible number of retries.
H1 Parity error
The parity check result does not
match the specified parity.
H2
Sumcheck
error
The sumcheck value in the
computer does not match that of
the data received by the drive
unit.
H3
Protocol
error
Data received by the drive unit is
in the wrong protocol, data
receive is not completed within
the given time, or CR and LF are
not as set in the parameter.
H4
Framing
error
The stop bit length differs from the
initial setting.
H5 Overrun
New data has been sent by the
computer before the drive unit
completes receiving the preceding
data.
If errors occur
consecutively more
than the permissible
number of
communication retries
(Pr. 121 setting), the
drive unit displays
E. PUE and comes to
an alarm stop.
Refer to: Chapter 6,
6.1.1
Protective
function
activated
H7
Character
error
The character received is invalid
(other than 0 to 9, A to F, control
code).
HA Mode error
Parameter write was attempted in
other than the computer link
operation mode or during drive
unit operation, for example.
HB
Instruction
code error
The specified command does not
exist.
HC
Data range
error
Invalid data has been specified for
parameter write, running speed
write, etc.
The receive data is
made invalid and the
drive unit continues
operation.