Precision Digital Corporation ProtEX-MAX PD8-6300, Инструкция по эксплуатации

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PD8-6300 Pulse Input Rate/Totalizer, Counter & Tachometer
Instruction Manual
52
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 on-board 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
Ordering Information on page 7 for details.
•
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 ProtEX-MAX Modbus Register Tables
located at
www.predig.com for details.
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 input signal
conditioner applied to the input (linear), low-flow
cutoff, and analog output programming. The multi-
point linearization is part of the linear function
selection.
Input Signal Conditioning (
Functn
)
The Function menu is used to select the input signal
conditioner applied to the input: linear, where the
multi-point linearization is part of the linear function
selection.
Meters are set up at the factory for linear function with
2-point linearization. The linear function provides a
display that is linear with respect to the input signal.
Multi-Point Linearization (
Linear
)
Meters are set up at the factory for linear function with
2-point linearization. Up to 32 linearization points can
be selected under the linear function. The multi-point
linearization can be used to linearize the display for
non-linear signals.
Low-Flow Cutoff (
CutofF
)
The low-flow cutoff feature allows the meter to be
programmed so that it always displays zero at very
low flow rates.
The cutoff value may be programmed from 0.1 to
999999. The meter will display zero below the cutoff
value. Programming the cutoff value to zero disables
the cutoff feature.