MODBUS communication
10.3 MODBUS functions
3KC ATC6500 transfer control device
Manual, 05/2019, L1V30538268002A-01
191
LRC calculation
Information on the LRC calculation can be found under www.modbus.org in the MODBUS
over Serial Line Specification and Implementation Guide
(http://www.modbus.org/docs/Modbus_over_serial_line_V1_02.pdf
).
10.3.6 Password entry by means of MODBUS
If the password is entered incorrectly by means of MODBUS three times in succession,
access to the device is blocked for 15 minutes.
The device is supplied from the factory with a remote password (3000) for
communication.
Entering the password using MODBUS
In order to enter the password, it must be sent with function 06 to the address 0x1FF6.
Example:
Transmission of the password (3000) by the master (if the device is set to address 01):
Response of the slave if the password is correct:
When the password has been entered, communication with the device can begin. If an
attempt is made to communicate with the device without entering the password, an error
message appears.
Example:
Query by the master:
Response of the slave:
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