ION 8000 Series User Guide Scenarios for Standard Security - Front Panel Security Enabled
Chapter 5 - Security Page 59
3. Access through Modbus on ANY comm port (serial, modem,
optical and Ethernet)
On ION meters, Modbus implementation consists of two parts:
i. Modbus Data
Includes the Modbus Slave ION modules.
These modules are configurable as to what data is available and where in
the range of Modbus registers this data is placed.
ii. Modbus Setup
Also referred to as the Modbus Map (see Power Measurement’s
“Modbus Protocol” document).
Uses fixed functionality and register mapping.
4. Accessing the Modbus data section with Standard Security
When accessing the Modbus Data section with Standard Security enabled, you:
Can read from the data section at all times.
Can write to the data section if the Modbus Slave Module is set to "Unsigned
16Bit Input Mode", and the Front Panel Security is disabled or the password is
set to zero.
Cannot write to the data section if the Front Panel Security is enabled and the
password is set to a non-zero value.
5. Accessing the Modbus setup section with Standard Security
When accessing the Modbus Setup Section with Standard Security enabled, you:
Can read from the setup section at all times.
Can write to the setup section if the Front Panel Security is disabled or the
password is set to zero.
Cannot write to the setup section if the Front Panel Security is enabled and set to
a non-zero value.
Time syncs are considered to be a Modbus Setup parameter and follow the same
rules above for writing a time sync to the meter. Also, the ION Clock Module must
have its Time Sync Source setup register set to the appropriate communication port.
The Modbus Slave module and the Clock module setup registers are only
accessible via ION protocol. Their settings are therefore protected by the security
settings on the ION device.
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