29
DP20 Economical Multisignal meter
Instruction Manual
Protocol
Modbus RTU
Bus type
RS-485, configurable for 9.600 or 4800 bps
Addresses
1 to 247
Formats
configurable 8n1, 8e1, 8o1, 8n2
Functions
4
read register
Registers
0
reading value (16 bits)
1
number of decimals (16 bits)
Errors
0
function
not
supported
1
register not accessible
Isolation
1000 Vdc
Slots allowed
Opt.1
2.3 Module S1 (Modbus RTU)
The S1 module offers 1 Modbus RTU serial output, isolated, to be
installed at slot Opt1.
Configuration is done from the front keypad, through the configuration
menu. The instrument must be informed that there is a Modbus RTU
module at slot.1 and this is done at the configuration menu ‘Tool’ \
‘out.1’ (see section 1.28.7). Then configure the bus parameters at the
configuration menu ‘out.1’ \ ‘r485’ (see section 1.28.8).
The S1 module can be ordered installed in to a Series C instrument
or standalone for later installation, as it does not require soldering or
special configuration.
Terminal B
B
Terminal A
A
Terminal G
GND
Power
Signal
Installing, calibrating and configuring 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 installation is
needed, follow the next steps :
1.
Access the instrument and install the M1 module at slot Opt.1
(see section 1.25).
2.
From the ‘Configuration menu’ go to ‘tool’ \ ‘out.1’ and select
value ‘420’ (see section 1.28.7) to inform the instrument that there
is a M1 analog output module installed.
From this point you will need the calibration sheet provided together
with the module M1. This sheet shows the values for parameters
‘cAL.y / 4mA’ and ‘cAL.y / 20mA’.
3.
When selecting ‘420’ the instrument shows ‘cAL.n’. (‘Do not
calibrate’). Press ‘UP’ (
5
) to read ‘cAL.y’ (‘Calibrate’).
4.
When selecting ‘cAL.y’ (‘Calibrate’) select ‘4 mA’. Display shows
a number. Introduce the value of the ‘cAL.y / 4mA’ indicated at the
calibration 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 configuration menu.
5.
Repeat with the ‘20 mA’ parameter, and update with the value
‘cAL.y / 20mA’ indicated at the calibration sheet. Validate with
key ‘SQ’ (
<
), and press key ‘LE’ (
3
) several times to exit the
‘Configuration menu’.
6.
The instrument will reboot when exiting the menu. The analog
output is calibrated.
Note : if you do not have the calibration 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 calibration value by
checking the miliammeter value.
At this point the module is installed and calibrated. Now configure
the reading associated to the output signal 4 mA and 20 mA.
7.
Configure the reading associated to the 4 mA output signal
and the reading associated to the 20 mA output signal, at the
configuration menu ‘out.1’ \ ‘420’ (see section 1.28.8).
Do not calibrate
Calibrate
Option 1
analog output
relay
Disabled
Tools
Modbus RTU
B A G
Opt.1
GND
B
A
