Omega DP20 User Manual

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DP20 Economical Multisignal meter Instruction Manual
Protocol Modbus RTU
Bus type
RS-485, congurable for 9.600 or 4800 bps
Addresses 1 to 247
Formats congurable 8n1, 8e1, 8o1, 8n2
Funcons 4 read register
Registers 0 reading value (16 bits)
1 number of decimals (16 bits)
Errors 0 funcon not supported
1 register not accessible
Isolaon 1000 Vdc
Slots allowed Opt.1
2.3 Module S1 (Modbus RTU)
The S1 module oers 1 Modbus RTU serial output, isolated, to be
installed at slot Opt1.
Conguraon is done from the front keypad, through the conguraon
menu. The instrument must be informed that there is a Modbus RTU
module at slot.1 and this is done at the conguraon menu ‘Tool’ \
‘out.1’ (see secon 1.28.7). Then congure the bus parameters at the
conguraon menu ‘out.1’ \ ‘r485’ (see secon 1.28.8).
The S1 module can be ordered installed in to a Series C instrument
or standalone for later installaon, as it does not require soldering or
special conguraon.
Terminal B B
Terminal A A
Terminal G GND
PowerSignal
Installing, calibrang and conguring a M1 module
If the M1 module has been acquired installed in the instrument, then
the module has been factory calibrated. In this case you can jump
directly to point 7 below.
If the M1 module has been acquired separately and installaon is
needed, follow the next steps :
1. Access the instrument and install the M1 module at slot Opt.1
(see secon 1.25).
2. From the ‘Conguraon menu’ go to ‘tool’ \ ‘out.1’ and select
value ‘420’ (see secon 1.28.7) to inform the instrument that there
is a M1 analog output module installed.
From this point you will need the calibraon sheet provided together
with the module M1. This sheet shows the values for parameters
‘cAL.y / 4mA’ and ‘cAL.y / 20mA’.
3. When selecng ‘420’ the instrument shows ‘cAL.n’. (‘Do not
calibrate’). Press ‘UP’ (5) to read ‘cAL.y’ (‘Calibrate’).
4. When selecng ‘cAL.y’ (‘Calibrate’) select ‘4 mA’. Display shows
a number. Introduce the value of the ‘cAL.y / 4mA’ indicated at the
calibraon sheet provided together with the M1 module. Increase
the numerical value with key ‘UP’ (5) and reduce the value with
key ‘LE’ (3). Validate the value with key ‘SQ’ (<). See below an
image of the conguraon menu.
5. Repeat with the ‘20 mA’ parameter, and update with the value
‘cAL.y / 20mA’ indicated at the calibraon sheet. Validate with
key ‘SQ’ (<), and press key ‘LE’ (3) several mes to exit the
‘Conguraon menu’.
6. The instrument will reboot when exing the menu. The analog
output is calibrated.
Note : if you do not have the calibraon sheet which was shipped
together with the M1 module, you can use a miliammeter to
measure the mA at the output loop. Then access parameters
‘cAL.y / 4mA’ and ‘cAL.y / 20mA’ and adjust the calibraon value by
checking the miliammeter value.
At this point the module is installed and calibrated. Now congure
the reading associated to the output signal 4 mA and 20 mA.
7. Congure the reading associated to the 4 mA output signal
and the reading associated to the 20 mA output signal, at the
conguraon menu ‘out.1’ \ ‘420’ (see secon 1.28.8).
Do not calibrate
Calibrate
Opon 1
analog output
relay
Disabled
Tools
Modbus RTU
B A G
Opt.1
GND
B
A

Omega DP20 Specifications

General

Brand	Omega
Model	DP20
Category	Measuring Instruments
Language	English