Operating Instructions

63 Siemens Industry, Inc.
Disabled
(OFF)
Service Type
5
V_Input
1 or 2
Description
31 Char
Channels
Volt Ref
CT Type
Range
Phase
Shift
CT Multiplier
CT
Sign
CH1
L1 – N [1]
OFF [0]
Any > 0A
-3.0˚ to +3.0˚
Any > 0 [1]
0 or 1
CH2
L2 – N [2]
OFF [0]
Any > 0A
-3.0˚ to +3.0˚
Any > 0 [1]
0 or 1
CH3
L3 – N [3]
OFF [0]
Any > 0A
-3.0˚ to +3.0˚
Any > 0 [1]
0 or 1
Even though disabled channels are not used in calculations and report 0.0 they still contain configuration information. It is suggested
that they be set to a known value rather than left at defaults to facilitate configuration validation by the RTU.
Configuring System Registers
Modbus Absolute Address/BACnet Object Assignment
REGISTER TEMPLATE
Description
2601
PF Sign Convention
2248
V1 Multiplier
2203,2204
V2 Multiplier
2205,2206
Configurations
System
Description
31 Char
PF Sign Convention
ANSI [1] or IEEE[2]
V1 Multiplier
Any > 0 [1]
V2 Multiplier
Any > 0 [1]
Modbus Protocol Commands
If configured for Modbus, the MD-xxHD networked power meter family follows the Modbus RTU protocol and
supports the following command set.
Supported Modbus Commands
Command Name
Command Number
(Hex)
Description
Read Holding Registers
03
Used to read the data values from the MD-xxHD meter
Write Single Register
06
Used to write a single holding register to a MD-xxHD 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 MD-xxHD meter
Slave Address
For Modbus/TCP the base slave address (or “unit address” as the Modbus TCP spec. calls it) is fixed at 1.
See the Serial Protocols section for additional information on setting the Slave Address and finding the
address of a specific meter element.