D.13
Date Code 20020903
SEL-587Z Instruction Manual
Modbus RTU Communications Protocol
Modbus Commands
defines the command codes, their function and associated
parameters, and the Modbus function code used to initiate the related
command code.
Table D.16
Modbus Command Codes
Command Code
Function
Parameter
Definition
Modbus Function
Code
01
Open
No Parameter
06h, 10h
02
Close
No Parameter
06h, 10h
03
Reset Targets
No Parameter
06h, 10h
04
Trigger
No Parameter
06h, 10h
05
Pulse OUT1
1–30 seconds
duration (defaults
to 1 second)
06h, 10h
06
Pulse OUT2
1–30 seconds
duration (defaults
to 1 second)
06h, 10h
07
Pulse OUT3
1–30 seconds
duration (defaults
to 1 second)
06h, 10h
08
Pulse OUT4
1–30 seconds
duration (defaults
to 1 second)
06h, 10h
09
Pulse Alarm
1–30 seconds
duration (defaults
to 1 second)
06h, 10h
10
Switch Protocol
a
a
Switches the serial port protocol to SEL-ASCII, the baud rate, parity, stop bits, and flow
control remain the same.
0080h
06h, 10h
11
b
b
Parameter of Command code 11 is bit masked to allow you to manipulate several data regions
simultaneously.
Reset Data Regions
0000 0000 0000
0001 Demand
Metering
0000 0000 0000
0010 Peak Metering
0000 0000 0000
0100 History Buffer
0000 0000 0000
1000 Communica-
tion Counters
06h, 10h
NOTE:
Following a reset of the
History Buffer, the History Selection,
Event Selection, and Event Channel
Selection (see
) remain at the same values
as previously set. Additionally,
History and Event records that do not
contain data, because they are
cleared, will return “not applicable”
(8000 hex) for all values.
Содержание SEL-587Z
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