9 Modbus RTU – integrated Modbus port specification
9.3 Modbus register map
PXR Electronic trip unit
01/21 MN012005EN
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9.3.3 Setting register
The release set points are arranged in four groups (groups 0 to 3).
Each group can be conceived as a binary array of information that is obtained
by accessing the Modbus register. Register 403001 is a R/W register that is
used to select the respective group (default: group 0). The high byte contains
the desired group number, while the low byte must contain the value 255
(0x0FF). The setting register can be read out with function codes 03 or 04.
Function code 06 can be used to write to register 403001. For trip units that
support settings, the settings of groups 0, 1, 2 and 3 should be written one
after the other using function code 06. Before reading or writing the settings,
the appropriate group should be selected by writing to register 403001. Prior
to writing the settings, the correct password must be entered, and the
settings have to be written within 10 seconds of the password check.
Figure 14: Reading from setting registers – Modbus RTU
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403003
403001
403002
Rated current
Rated current
Frame size
403004
Trip type - part 1
Integrated Modbus -
communication address
Status of CAM
connenction
Read with
function codes 03 or 04
Write value 255
To select group 0
Write value 511
To select group 1
Write value 767
To select group 2
Write value 1023
To select group 3
Write with
function code 06
Group 0
(System Group)
Group 1
(Protective Group)
Group 2
(Modbus Group)
Group 3
(CAM Group)
Register N°
READING FROM SETTING REGISTERS - MODBUS RTU
Setpoint name
