DDMC Analog Input Process Meter / Controller
Instruction Manual
38
Advanced Features Menu & Display Messages
Display
Parameter
Action/Setting
dO 1
Digital output 1
Assign digital output 1 – 8,
if expansion modules are
connected
ICal
Internal source
calibration
Enter internal source
calibration (used for
scaling the meter without a
signal source)
C CAL
Current
calibration
Calibrate 4-20 mA current
input (internal reference
source used for scaling the
input)
C lo
Current low
Calibrate low current input
(e.g. 4 mA)
C Hi
Current high
Calibrate high current input
(e.g. 20 mA)
v CAL
Voltage
calibration
Calibrate voltage input
v Lo
Voltage low
Calibrate low voltage input
(e.g. 0 V)
v Hi
Voltage high
Calibrate high voltage input
(e.g. 10 V)
Diag
Diagnostics
Display parameter settings
LED t
LED test
Test all LEDs
(press menu to exit test)
Info
Information
Display software number
and version
Erase
Erase
Erase DDMC Meter View
SW stored in meter’s
memory
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.
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
Selection
Actual
Value
Display
Value
Actual
Value
Display
Value
1
12.022
12.022
12.023
12.023
5
12.022
12.020
12.023
12.025
10
12.024
12.020
12.025
12.030
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
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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.
