2.6 Modbus Setup
Your PQube 3 has a built-in Modbus-over-TCP server that you can use to read meters in real time
and determine when new event or trend recordings are available.
You can set the following parameters in your PQube 3’s Setup.ini file:
Modbus Base Address: The global base address from which all registers are offset. Default is 0x7000.
Modbus Query Port: The TCP/IP port on which the Modbus server listens. Default is Port 502.
Modbus Byte Order: Data values spanning multiple registers (such as floats) can be reported in BIG
ENDIAN or LITTLE ENDIAN. Default is BIG_ENDIAN.
Modbus Slave ID: The PQube 3 can be assigned a slave ID required in queries. Default value is 0x1.
2.6.1 Scan Rates, Client Load, and Limitations
The Modbus protocol limits single query register results to 125 registers per scan. The client, PQube
3, and network speeds determine the scan rate of the register sets. However, the PQube 3 Modbus
register values only update at the internal meter update rate, which is around 2 Hz. Therefore, if
higher scan rates are supported, they will be limited to 2 Hz.
The PQube 3 supports multi-client, multi-session Modbus, with conventional limits to 10 clients at a
time. This value can be changed internally in software.
2.6.2 Supported Clients
The PQube 3 supports the Powerside Modbus Client, third party free Modbus clients, or any
software conforming to the Modbus protocol.
2.6.3 Register List (refer to Modbus Reference Manual)
Refer to the PQube 3 Modbus Reference Manual for the register tables.
2.6.4 Downloads
The Powerside Modbus Client and PQube 3 Modbus Reference Manual are available for download
on the powerside.com website.
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