Leviton 71D03 - Page 51

51
7.4 Conguring System Registers
7.5 Modbus Protocol Commands
If congured for Modbus, the networked power meter family follows the Modbus
RTU protocol and supports the following command set.
Slave Address
For Modbus/TCP, the base slave address (or unit address, as the Modbus TCP
spec calls it), is xed at 1.
Refer to the section Serial Protocols for additional information on setting the Slave
Address and nding the address of a specic meter element.
Modbus String Entry
Registers that are identied as strings are handled uniquely by the VerifEye
®
power meter. Each register in the string block must be written sequentially without
interruption either by using a write multiple command, or by sending single
register commands back to back. The nal character in the string MUST be a
NULL character (ASCII 0). The meter processes 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.
Register Template
Description 2601
PF Sign Convention
2248
V1 Multiplier 2203,2204
V2 Multiplier 2205,2206
System
Description 31 Char
PF Sign Convention
ANSI [1] or IEEE[2]
V1 Multiplier Any > 0 [1]
V2 Multiplier Any > 0 [1]
Supported Modbus Commands
Command Name Command
Number (Hex)
Description
Read Holding Registers
03 Used to read the data values from the VerifEye
®
meter
Write Single Register 06 Used to write a single holding register to a VerifEye
®
meter
Report Slave ID 11
Used to read information from the identified VerifEye
®
meter
Modbus Absolute Address/
BACnet Object Assignment
Congurations
7 RTU PROGRAMMING AND SCRIPTING
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