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PowerScout HD
RTU Programming & Scripting
CONFIGURING SYSTEM REGISTERS
Modbus Absolute Address/BACnet Object Assignment
Configurations
Modbus Protocol Commands
If configured for Modbus, the PSHD networked power meter family follows the Modbus RTU protocol
and supports the following command set.
Supported Modbus Commands
Command Name Command Number Description
Read Holding Registers 03 Used to read the data values from the PSHD meter
Write Single Register 06 Used to write a single holding register to a PSHD meter
Write Multiple Registers 16 (0x10)
Used to write multiple registers (useful but not required for
32-bit values and strings)
Report Slave ID 17 (0x11) Used to read information from the identified PSHD meter
SLAVE ADDRESS
For Modbus/TCP, the base slave address (or “unit address,” as the Modbus TCP specification calls it) is
fixed at 1.
Refer to the section “Serial Protocols” for additional information on setting the Slave Address and
finding the address of a specific meter element.
MODBUS STRING ENTRY
Registers that are identified as “strings” are handled uniquely by the PSHD power meter. Each register in
the string block must be written to sequentially, without interruption, either by using a “write multiple”
command or by sending single register commands back to back. The final character in the string MUST
be a NULL character (ASCII 0). The meter will process the entire string only if these two conditions are
met, otherwise the data is ignored. This special processing has been implemented to protect partial
updates for network settings.
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