Modbus Port
The Modbus Port is used for the unit’s software configuration and for communicating to remote devices.
The port is equipped for:
• RS-485
• Half Duplex
• 1,200 to 38,400 Baud
• Modbus RTU
• Slave Mode
The port can be used for the following Modbus functions.
Function
Code Description Action
1 Read Relay Output Status Obtain current status of Relay Output
2 Read Digital Input(DI) Status Obtain current status of Digital Input
3 Read Data Obtain current binary value in one or more registers
5 Control Relay Output Force Relay to a state of on or off
16 Press Multiple-Register
Place specific binary values into a series of
consecutive Multiple-Registers
The Capabilities of the Modbus Protocol are shown below. Some of the data is limited to specific models and
the options that are provided.
Item Details Read/Write
Capability
Data
Type
System Set-up These are all the unit’s set-up parameters which are
configured through the software. They can be viewed or
edited.
Read/Write 16 bit
Analog
Measurements
These are all the instantaneous measurements in the meter
which can be configured for Primary or Secondary units: (V,
I, Watts, VARS, VA, PF, Frequency, Unbalance, Demand)
Read 32 bit
Energy
Measurements
These energy measurements can be retrieved or reset
(cleared to 0) and include: Whr, VARhr,(delivered,
received, Total, & Net), VAhr (Range: 0-999,999,999)
Read/Write 32 bit
Harmonics The harmonic measurements include: Current & Voltage
THD and Individual per phase
Read 16 bit
Max/Min This data includes all the Max/Min data (if provided for that
meter type) along with the timestamp when it occurred
Read 16 bit
Alarm Data This provides all the alarms set along with the timestamp Read 16 bit
Pulse Counter This provides the total number of pulses counted for that
input
Read 16 bit
Sequence of Events This provides the last 20 events with the time stamp and
digital input number
Read 16 bit
Unit Status Provides the current status of all I/O options. For Digital
I/O, it provides the ON/OFF status. For Analog I/O, it
provides the actual value
Read 16 bit
Control Outputs This provides the ability to turn and off the digital outputs Write 16 bit
Date and Time This is used to retrieve and set the system date and time Read/Write 16 bit
(134 Seiten)
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