R
R
G
G
U
U
-
-
1
1
0
0
/
/
R
R
G
G
U
U
-
-
1
1
0
0
C
C
e
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l
l
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c
c
t
t
r
r
o
o
n
n
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c
c
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a
a
r
r
t
t
h
h
l
l
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a
a
k
k
a
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g
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p
p
r
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o
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Page 27
MODBUS
© protocol
The RGU-10C earth leakage communicates using the MODBUS RTU© protocol (Pulling Question / Answer).
In the MODBUS protocol the RTU (Remote terminal Unit) mode is used; each 8-bit byte in a message contains two 4-
bits hexadecimal characters.
The format for each byte in RTU mode
Code 8 bits binary, hexadecimal 0-9, A-F
2 hexadecimal characters contained in each 8-bit field in the message.
Bits per byte 8 data bits
Field Check-Error CRC Type (Cyclical Redundancy Check)
MODBUS functions used:
Function 04h Reading
Function 10h Writing
MODBUS© memory map
Parameter
Symbol
Values Units Address
Reading
Writing
Peripheral No.
PERI
1 – 99 - 0000h R/W
Baud rate
bd
2,400 - 4,800 - 9,600 - 19,200
38,400 - 57,600 - 115,200
bauds 0001h R/W
Type of parity
PARI
None, Odd, Even - 0002h R/W
Operating frequency
FREC
50 – 60 Hz 0003h R/W
Trip current
Main relay
Id
0.03 - 0.1 - 0.3 - 0.5 - 1
3 - 5 - 10
Amperes 0004h R/W
Delay time
Main relay
td
INS – SEL – 0.02 – 0.1 – 0.3 – 0.4 – 0.5
0.75 – 1 – 3 – 5 – 10
seconds 0005h R/W
Contact polarity
Main relay
Std/+
Standard - Positive - 0006h R/W
Trip current
Pre-alarm
Id’
OFF – 50 – 60 – 70 – 80 % 0007h R/W
Delay time
Pre-alarm
td’
0.02 – 0.1 – 0.2 – 0.3 – 0.4 – 0.5 – 0.75
1 – 3 – 5 – 10
seconds 0008h R/W
Contact polarity
Pre-alarm
Std/+
Standard - Positive - 0009h R/W
Pre-alarm reclosing
REC
Manual - REC - 000Ah R/W
Series No. (HI)
-
18ADh - 188Ch - 000Bh R
Series No. (LO)
-
0000h - FFFFh - 000Ch R
Equipment version
-
0 – 100 - 000Dh R
Relay contacts status
-
Off - On (Main)
On (pre-alarm)
- 0014h R
Effective value
Current leakage
-
0 – 65,000 mA 0015h R
Effective value
Trip current.
-
0 – 65.000 mA 0016h R
Trip and external reset
-
0000h – Reset
FFFFh - Test
- 0019h W
Enable setting saving
-
0000h - Enable
FFFFh - Save
- 001Ah W
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