Noise Filter (Filter); Noise Filter Bypass (Bypass); Rounding Feature (Round); Modbus Rtu Serial Communications (Serial) - Ametek DDMC Instruction Manual

DDMC Analog Input Process Meter / Controller
Advanced Features Menu & Display Messages
Display Parameter
Digital output 1
dO 1
Internal source
ICal
calibration
Current
C CAL
calibration
Current low
C lo
Current high
C Hi
Voltage
v CAL
calibration
Voltage low
v Lo
Voltage high
v Hi
Diagnostics
Diag
LED test
LED t
Information
Info
Erase
Erase

Noise Filter (filter)

The noise filter is available for unusually noisy signals
that cause an unstable process variable display. The
noise filter averages the input signal over a certain
period. The filter level determines the length of time
over which the signal is averaged. The filter level can
be set between 2 and 199. The higher the filter level,
the longer the averaging time and so the longer it
takes the display to settle to its final value. Setting the
filter level to zero disables the filter function.

Noise Filter Bypass (bypass)

The noise filter bypass changes the behavior of the
meter so that small variations in the signal are filtered
out but large abrupt changes in the input signal are
displayed immediately. The bypass value determines
the minimum amount of signal change to be displayed
immediately. All signal changes smaller than the
bypass value are filtered or averaged by the meter.
The noise filter bypass may be set between 0.1 and
99.9% of full scale.
Action/Setting
Assign digital output 1 – 8,
if expansion modules are
connected
Enter internal source
calibration (used for
scaling the meter without a
signal source)
Calibrate 4-20 mA current
input (internal reference
source used for scaling the
input)
Calibrate low current input
(e.g. 4 mA)
Calibrate high current input
(e.g. 20 mA)
Calibrate voltage input
Calibrate low voltage input
(e.g. 0 V)
Calibrate high voltage input
(e.g. 10 V)
Display parameter settings
Test all LEDs
(press menu to exit test)
Display software number
and version
Erase DDMC Meter View
SW stored in meter's
memory
38

Rounding Feature (round)

The rounding feature is used to give the user a
steadier display with fluctuating signals. Rounding is
used in addition to the filter function.
Rounding causes the display to round to the nearest
value according the rounding selected. See examples
below:
Rounding Actual Display
Value Value
Selection
1 12.022 12.022
5 12.022 12.020
10 12.024 12.020
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 micro USB connection.
For ongoing digital communications with a computer
or other data terminal equipment, an RS-232, or
RS-485 option is required; see Ordering Information
on page Error! Bookmark not defined. for details.
DO NOT connect any equipment other than
•
AMETEK's expansion modules, cables, or meters
to the RJ45 M LINK connector. Otherwise
damage will occur to the equipment and the
meter.
Note: More detailed instructions are provided with
each optional serial communications adapter.
Note: Refer to the Modbus Register Tables located at
www.ametekusg.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.
Instruction Manual
Actual Display
Value Value
12.023 12.023
12.023 12.025
12.025 12.030