Acromag Vertu Series User Manual

Vertu Series VPM3000 Process Meters & Temperature Transmitters
Instruction Manual
30
Serial Communications (serl)
The meter is equipped with serial communications
capability as a standard feature using DisplayWizard
software or using the Modbus RTU protocol. To
communicate with a computer or other data terminal
equipment, an RS-232, RS-485, or USB adapter
option is required; see Ordering Information on
page 6 for details.
When using more than one meter in an RS-485 multi-
drop mode, each meter must be provided with its own
unique address. The address may be programmed
from 00 to 99 for PDC protocol and from 1 to 247 for
Modbus protocol. The transmit delay may be set
between 0 and 199 ms (see Serial Communication
Adapter manual for more details).
The Vertu can also be connected directly to another
Vertu meter through a cable assembly (APMA7420).
This allows the user to copy all the settings from one
meter to another, using the Copy function.
Protocol Selection Menu (Prot)
The Protocol selection menu is used to select either
the PDC (Factory use only) or the Modbus protocol.
PDC protocol should be selected to run
DisplayWizard software.
Select Menu (SElc)
The Select menu is used to select linear or square
root function, display intensity, and low-flow cutoff.
Selection for relay or analog output is a factory setting
depending on the option installed.
• Output options are installed and set up at the
factory.
• Changing the output selection will cause
erroneous operation.
No
te: Depending on meter model, the Select menu will
display either out or Aout. In either case, the output selection
menu is for factory use only. Do not attempt to change
output selection.
Linear or Square Root Function
(linr or Sqrt)
Meters are set up at the factory for linear function.
The linear function provides a display that is linear
with respect to the input signal.
The square root function is used to linearize the signal
from a differential pressure transmitter and display
flow rate in engineering units.
Low-Flow Cutoff (cutF)
The low-flow cutoff feature allows the meter to be
programmed so that the often-unsteady output from
a differential pressure transmitter, at low flow rates,
always displays zero on the meter.
The cutoff value may be programmed from 0 to 9999.
Below the cutoff value, the meter will display zero.
Programming the cutoff value to zero disables the
cutoff.

Acromag Vertu Series Specifications

General

Brand	Acromag
Model	Vertu Series
Category	Measuring Instruments
Language	English