Helios PD2-6400 High Voltage & High Current Meter
Instruction Manual
40
Modbus RTU Serial
Communications (
serial
)
The meter is equipped with serial communications
capability as a standard feature using Modbus RTU
Serial Communication Protocol.
The meter may be connected to a PC for initial
configuration via the onboard USB connection. For
ongoing digital communications with a computer or
other data terminal equipment, use the RS-485
connection with the appropriate serial converter; see
•
DO NOT
connect any equipment to the RJ45
M-LINK connector. Otherwise damage will occur
to the equipment and the meter.
•
DO NOT
disconnect the RJ45 connector located
to the left of the power terminal block. Doing so
will disable the on-board digital I/O, and the
RS-485 serial communications.
Notes:
1. More detailed instructions are provided with each
optional serial communications adapter.
2. Refer to the Helios Modbus Register Tables
located at
When using more than one meter in a multi-drop
mode, each meter must be provided with its own
unique address. The meter address (Slave ID) may
be programmed between 1 and 247. The transmit
delay may be set between 0 and 199 ms. The parity
can be set to even, odd, or none with 1 or 2 stop bits.
Select Menu (
SElect
)
The
Select
menu is used to select the number of
linearization points applied to the input for either
channel A or V, adder and factor constants applied to
the power function P=([I*V]+C)*F, low-value cutoff,
and analog output programming.
Multi-Point Linearization (
Linear
)
The multi-point linearization can be used to linearize
the display for non-linear signals. The
Function
menu
is used to access the
Linear
menu and select the
number of linearization points applied to the input for
either Ch-A or Ch-V. Meters are set up at the factory
for linear function with 2-point linearization. Up to 32
linearization points can be selected for each channel
under the linear function.
Note: After Scale is displayed continue pressing the
Enter button until the meter completes the scaling of
the input and display values.
