34
Appendix B - Modbus Communication
Addressing
Registers table
In the table 5 are showed the visible via Modbus (RTU)
registers.
Memory registers
Maximum and Minimum values are stored and saved from
register 0x2100 to register 0x215F.
The last four weeks data (from current day) are stored and
saved daily, at the beginning of the 5th week the maximum
and minimum values of the entire older week are stored
and saved in 0x2138 and 0x2139 registers and so on.
Summarizing, in this table (6) the data are collected as
follows:
1. In the first 28 rows are saved max and min of the
latest 28 days;
2. In the remaining rows are saved max and min of the
oldest 19 weeks.
Modbus address: 112 to 127 (default)
Note: in the market is still present the first generation with the
modbus address range 32 (default) to 47.
It is not possible to give an address outside of range from 112
to 127.
The address can be modified from default value by dipswitches
on electronic board. The dipswitches involved are ones from 1
to 4 and they can be modified according to table 3.
NOTE
DIP SWITCHES
ADDRESS
4
3
2
1
127
OFF
OFF
OFF
OFF
126
OFF
OFF
OFF
ON
125
OFF
OFF
ON
OFF
124
OFF
OFF
ON
ON
123
OFF
ON
OFF
OFF
122
OFF
ON
OFF
ON
121
OFF
ON
ON
OFF
120
OFF
ON
ON
ON
119
ON
OFF
OFF
OFF
118
ON
OFF
OFF
ON
117
ON
OFF
ON
OFF
116
ON
OFF
ON
ON
115
ON
ON
OFF
OFF
114
ON
ON
OFF
ON
113
ON
ON
ON
OFF
112
ON
ON
ON
ON
Table 4
Table 5
Table 6
Register
Type R/W
Function
0x2000
W
R
Electronic board input
0x2001
W
R/W
Electronic board output
0x2002
W
R
Level probe value (ml)
0x2003
W
R
Operation number IN1
0x2004
W
R
Operation number IN2
0x2005
W
R
Relay operation number
0x2006
W
R
Time (minutes) electronic board
switched on
0x2007
W
R
Time (days) electronic board switched on
0x2008
W
R
Max level current day
0x2009
W
R
Min level current day
0x200A
W
R
Software version
Register
Type R/W
Function
0x2100
W
R
Level Sensor Maximum Value Day -1
0x2101
W
R
Level Sensor Minimum Value Day -1
0x2102
W
R
Level Sensor Maximum Value Day -2
0x2103
W
R
Level Sensor Minimum Value Day -2
0x2104
W
R
Level Sensor Maximum Value Day -3
0x2105
W
R
Level Sensor Minimum Value Day -3
………
…..
…..
…………………………………………..
0x2134
W
R
Level Sensor Maximum Value Day -27
0x2135
W
R
Level Sensor Minimum Value Day -27
0x2136
W
R
Level Sensor Maximum Value Day -28
0x2137
W
R
Level Sensor Minimum Value Day -28
0x2138
W
R
Level Sensor Maximum Value Week -5
0x2139
W
R
Level Sensor Minimum Value Week -5
………
…...
…..
……………………………………………
0x215C
W
R
Level Sensor Maximum Value Week -23
0x215D
W
R
Level Sensor Minimum Value Week -23
0x215E
W
R
Level Sensor Maximum Value Week -24
0x215F
W
R
Level Sensor Minimum Value Week -24
ELECTRONIC BUCHHOLZ RELAYS
eBR
