DV Power RMO25W User manual

RMO25W
W I N D I N G
OHMMETER
Manual
IBEKO POWER AB

2
RMO25W Contents
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
2 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
3 Designated Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 Functionality. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
5 Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
6 Getting Started. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 RMO Win Software . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
8 Error Messages. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9 Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
10 Accessories. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Manufacturer Contact Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Manual Version: RMO25W. MV.04.20
IBEKO POWER AB 2005
This Manual is a publication of IBEKO POWER AB, 181 25 Lidingö, Sweden.
All rights including translation reserved. Reproduction of any kind, e.g., photocopying,
microfilming or storage in electronic data processing systems, requires the explicit consent of
IBEKO POWER AB.
Reprinting, wholly or in part, is not permitted.
This Manual represents the technical status at the time of printing. The product information,
specifications, and all technical data contained within this manual are not contractually binding.
IBEKO POWER AB reserves the right to make changes at any time to the technology and/or
configuration without announcement. IBEKO POWER AB is not to be held liable for statements
and declarations given in this manual. The user is responsible for every application described in
this manual and its results.
IBEKO POWER AB explicitly exonerates itself from all liability for mistakes in this manual.

3
RMO25W Introduction, Safety Instructions
1 Introduction
This manual contains helpful instructions on how to use RMO25W in a safe, proper
and efficient way.
Following these instructions can help you to avoid dangerous situations, repair costs
and other miss happenings due to incorrect operation. Furthermore it ensures the
reliability and life cycle of your RMO25W.
RMO25W must be used in observance of all existing safety requirements/
regulations from national/local standards for accident prevention and environmental
protection.
Reading the RMO25W manual alone does not release the user from the duty of
complying with all national and international safety regulations relevant for working
with RMO25W.
2 Safety Instructions
Before operating RMO25W, please carefully read the following safety instructions.
It is not recommended that the RMO25W will be used (or even turned on) without
the understanding of this manual.
RMO25W should only be operated by trained and authorized personnel.
Rules for Use
• RMO25W should only be used when in a technically fit condition. Its use should
be in accordance with the safety regulations for the actual working site and
application. Always be aware of the dangers of high voltages and currents
associated with this equipment and its environment. Pay attention to the
information provided in the operations manual.
• RMO25W is intended exclusively for the application areas specified in
”Designated Use”. The manufacturer and distributors are not liable for damage
resulting from unintended usage. The user alone assumes all responsibility and
risk.
• The instructions provided in this manual are considered part of the rules
governing proper usage.
• Do not open RMO25W.
Orderly Practices and Procedures
• The manual should always be available on the site where the RMO25W is used.
• Before using RMO25W, all personnel (even personnel who only occasionally, or
less frequent, work with RMO25W) assigned to RMO25W should read the
operations manual.
• Do not undertake any modifications, extensions, or adaptations to the RMO25W.
Cleaning
To clean RMO25W, use a cloth dampened with isopropanol alcohol or water.

4
RMO25W Safety Instructions, Designated Use
Operator Qualifications
• Testing with RMO25W should only be carried out by authorized and qualified
personnel.
• Personnel receiving training, instruction, direction or education on the RMO25W
should remain under the constant supervision of an experienced operator while
working with the test set and the test object.
Safe Operation Procedures
• Hazardous voltages of up to 400V can occur inside RMO25W. Therefore is not
permitted to open RMO25W.
• Do not insert objects (e.g., screwdrivers, etc.) into the ventilation slots.
• Before putting RMO25W into operation, check the test set for visible damages.
• Do not operate RMO25W under wet or moist conditions (condensation).
• Do not operate RMO25W when explosive gas or vapors are present.
• The serial interface of RMO25W should only have external devices connected that
meet the requirements for SELV equipment according to EN 60950 or IEC 60950.
• When setting up RMO25W, make sure that the air slots of the test set remain
unobstructed.
• If RMO25W is opened by the customer, all guarantees are invalidated.
• If RMO25W seems to be functioning improperly, please contact the IBEKO
POWER AB (refer to section ”Manufacturer Contact Information”).
• Do not use RMO25W without the extra protective ground cables for RMO25W
and winding connected. Always establish this connection as the first one before
you do any other connections, and separate this connection as the very last one.
• Never open the measuring circuit while current flows (LED discharging diode lits
continually, and beeper alarms). High voltage, lethal dangerous, may occur.
Power Supply
• Supply RMO25W only from a power outlet that is equipped with protective ground .
• Instead of supplying RMO25W from phase – neutral (L1-N, A-N), it may also be
supplied from phase – phase (e.g., L1-L2; A-B). However, the voltage must not
exceed 240 V AC, please refer to section Technical Data.
3 Designated Use
The Winding OhmMeter RMO25W is designed for measuring resistances of inductive
test objects used in the electric power industry or similar branches. It is employed
for resistance measurement during manufacturing, commissioning and testing of:
transformers,
generators,
electrical motors,
bar installation,
cable splices.
Any other use of the RMO25W than the ones mentioned above is to be considered
improper and will not only invalidate all customer warranty claims but also exempt the
manufacturer from its liability for repair or exchange.

5
RMO25W Functionality
4 Functionality
The RMO25W generates a filtered (true) DC current.
RMO25W test set can measure the winding resistance of any transformer; small
or very large, single or three phase, star, delta or zig-zag connected. There are
two independent measuring channels which can used to simultaneously measure
resistance of up to two windings at the same time.
Choose measuring current so that for the expected resistance you have
maximum value of it (refer to section 6.5 on page 12).
Note: Before the test, measuring channels should be defined.
If one measuring channel is chosen, (Ch:1), then the left channel is
active.
At the start of the test a check of cables connection is done. In case of
disconnection, an alarm is activated, and the error message is shown
on the display.
RMO25W injects current with a voltage as high as 50 V at start. This ensures that
the test is as short as possible, and that the desired test current is reached as soon
as possible. The DC current is selectable up to 25 A. Testing current of 25A could
last up to 90 seconds, testing current of 10A could last up to 300 seconds, while
current of 5 A, and less, could last up to 900 seconds maximum. The test result is
displayed as R=U/I.
The test is started pressing the Ωbutton. When the current is stabilize, RMO25W
measures the resistance of the test object. During the test, a new result is shown
on the display approximately each second.
Each push on the Ωbutton results with input of the resistance current value into
the internal memory of RMO25W, and memory location changes to the next one.
Test could be accomplished two ways:
- Pushing to STOP button,
- Automatically after to expire of selected time.
In both cases upon accomplished test measured value of the resistance is recorded
to pre-selected internal memory location.
Minimal time of measurement is 60 seconds.
By pushing STOP button test could be performed at any time. When the STOP
button is pushed, the last measured result will remain saved in the internal
memory.
Upon expiry of the selected test lasting time, the last result remains saved at
selected memory location.

6
RMO25W Functionality
Note: Using RMOWin-W the results could be stored to PC, where results
reading interval is adjustable. Results will be shown in a table in
Excel format with option of additional edit and graphic presentation.
Using RMOWin-W after testing for transfer of results from selected
internal memory location to PC, it is possible to transfer only the
result of the last test.
When measuremet is complete starts current discharging. During current
discharging, discharging LED lits and beeper buzze. Discharge is complete
when LED discharge and the buzzer are OFF.
Both injection of current and discharging energy from the inductance is fully
automatic regulated. An intrinsically safe discharge circuit, with indicator,
dissipates the stored magnetic energy rapidly after the test.
Cooling of RMO25W is supported by a built-in fan that is automatically activated
every time a test is started from the Test menu. It continues running 5 minutes
after the test is finished.

7
RMO25W Description
5 Description
5.1 Front Panel Components
Display
UP/DOWN buttons to select
a menu and set test
p
arameters
LEFT/RIGHT buttons to
navigate in the active
menu
ENTER button to confirm the
defined test parameters,
Lan
g
ua
g
e
,
and Time and Date
STOP button
Press to stop a test or stop the alarm buzzer.
Ωbutton
Press to start a test.
Press to measuring the resistance current value.
Test parameters must be selected beforehand.
Green LED
• Lights continuously when RMO25W is turned on.
• Flashes when a test can be started.
• Flashes alternately with the red LED during a test.
Red LED
• Lights continuously in case of operational error.
• Flashes alternately with the green LED during a test.
STOP button to stop a test, to
acknowledge the alarm buzzer
and return to the Curr menu
Red LED - Discharge
• Continualy lits until accumulated energy of the
measured object is reduced to harmless value, and
beeper buzzes.
Within this period it is prohibited to disconnect
measuring cables.
Di
ode
o
r
beepe
r
cou
l
d
n
ot
be
s
wi
tc
h
ed
o
ff
by
S
T
O
P
butto
n.

8
RMO25W Description
5.2 Rear Panel Components
5.3 Setting RMO25W’s Language
To set RMO25W’s language, use the LEFT button, and then the UP buttons to
select the Language menu.
Move the cursor to the bottom line using the LEFT/RIGHT buttons, and select
the language with the UP/DOWN buttons.
Pressing ENTER to confirm, returns you to the Curr menu.
Pressing STOP to cancel, returns you to the Curr menu.
5.4 Setting RMO25W’s Time and Date
To set RMO25W’s internal time and date, use the LEFT button, and then the UP
buttons to select the Time menu.
Move the cursor to the position of your choice using the LEFT/RIGHT buttons, and
change the value with the UP/DOWN buttons.
Pressing ENTER to confirm, returns you to the Curr menu.
Pressing STOP to cancel, returns you to the Curr menu.
Connector for
mains power supply Power switch
I In this position, RMO25W is connected to
the mains power supply.
0 In this position, RMO25W is separated from
the mains power supply with both poles.
Equipotential connector.
For protection against parasitic currents or
voltages, always connect RMO25W
equipotential connector to protective ground
(PE).
Use only the original cable.
For safety reasons, always establish this
connection as the first one before you do
any other connections, and separate this
connection as the ver
y
last one.
Ventilation
Figure 5-1:
The Language
menu
Figure 5-2:
The Time menu showing
RMO25W’s internal time and date

9
RMO25W Getting Started
6 Getting Started
6.1 Connecting a Test Object to RMO25W
Before you connect a test object to RMO25W, make sure that:
• the test object is disconnected or separated from its circuit in accordance with
the national safety regulations and is properly grounded to protective earth,
• RMO25W itself is properly grounded. To do so, connect the grounding screw
on the back of RMO25W’s to PE using a grounding cable.
• That one end of measured windings was properly grounded.
C A U T I O N
FOR SAFETY REASONS, ALWAYS ESTABLISH THE CONNECTION OF
DEVICE WITH TEST OBJECT IN THAT WAY AS AT THE FIGURE 6-1.
DO NOT DISCONNECT LEADS BEFORE LED DISCHARGE AND THE
BUZZER ARE OFF.
Figure 6-1:
Connecting a test
object to RMO25W
With RMO25W turned off,
connect RMO25W to the
test object in such a way
that the measuring cables
from the "Voltage Sense"
sockets are attached as
close as possible to RX,
and in between the
current feeding cables.
That way, resistance of
both cables and clamps
is almost completely
excluded from the
resistance measurement.
To take care about
polarity while
connecting measuring
cables.

10
RMO25W Getting Started
6.2 Setting the Measurement Parameters
Turn on RMO25W with the power switch on the back of the test set. The display
shows the Curr menu and the green LED lights up.
In the Curr menu, define a test current for the test (here 10A).
To do so set the value of your choice by means of the UP/DOWN buttons. Maximum
duration of the current depends on its value. Testing current of 25A could last up to
90 seconds, testing current of 10A could last up to 300 seconds, while current of
5A, and less, could last up to 900 seconds maximum.
Define the memory position (here m:30).
Using button RIGHT move cursor to the position of memory location, and using
UP/DOWN select desired memory position to which obtained results will be saved.
Upon performed test (either due to time expire or due to push to the STOP button)
the last measured result will remain registered in RMO25W, and the memory
position is automatically switched over to the next memory position. It can be
recalled later by selecting that position’s number.
Using RIGHT button move cursor to the position of test duration, and using
UP/DOWN buttons select desired value.
Define the number active channels (here Ch:2).
Using button RIGHT move cursor to the number active channels, and using
UP/DOWN select desired number active channels.
Note: If one measuring channel is chosen, (Ch:1), then the left channel is
active.
Figure 6-2:
The Curr
m
e
n
u
Test current Memor
y
position
Test duration time
Menu name
N
um
b
er o
f
active channels

11
RMO25W Getting Started
6.3 Measuring with RMO25W
Before a test can be started, test current, number of active channels, memory
position and the test duration time need to be defined using the Curr menu.
Once these parameters are defined, press ENTER to change to the Test menu.
The Test menu displays the selected test current and its duration defined. If one of
these values has to be changed, press STOP to return to the Curr menu.
The flashing green LED indicates that RMO25W is now ready to start the test.
Press the Ωbutton to run a test.
During the test, both the green and the red LEDs flash alternately and buzzer
beeps. When the current is stabilize, RMO25W start measure the resistance of
the test object.
The display shows test curent (here 10,1 A) and the current value of the
measured resistance (here 356 mΩon channel 1 and 288 mΩon channel 2).
The time passed since the test begining is also shown on the display
(here 55 s).
Test could be accomplished two ways:
- Pushing to STOP button,
- Automatically after to expire of selected time.
When measeremet is complete RMO25W goes to the Res menu and starts
current discharging. During current discharging, discharging LED lits and
beeper buzze. Discharge is complete when LED discharge and the buzzer
are OFF.
Upon completed test at selected memory location the last measured result will
remain registered.
Figure 6-4:
The Test menu
before the test
Figure 6-5:
The Test menu
during the test

12
RMO25W Getting Started
Note: Using RMOWin-W the results could be stored to PC, where results
reading interval is adjustable. Results will be shown in a table in
Excel format with option of additional edit and graphic presentation.
Using RMOWin-W after testing for transfer of results from selected
internal memory location to PC, it is possible to transfer only the result
of the last test.
To stop the test , press the STOP button at any time during the test.
The voltage at the RMO25W output generation is immidatelly stoped, but
current still flows, because of the inductivity of test objects.
6.4 Discharge Current
Because of the enormous amount of energy that can be stored in a magnetic
field, precautions should be taken before disconnecting the test leads from the
transformer that is under test. Never remove the leads during the testing process
and always allow for enough time to completely discharge the transformer being
tested. Large transformers can require several minutes to discharge.
When measeremet is complete RMO25W goes to the Res menu and starts current
discharging. During current discharging, discharging LED lightens and beeper
buzzes. Discharge is complete when LED discharge and the buzzer are OFF.
C A U T I O N
DO NOT DISCONNECT LEADS BEFORE LED DISCHARGE AND THE
BUZZER ARE OFF.
6.5 Optimizing test
Accuracy given in the table is valid if the maximum possible current is used.
Range Test
Current
Nominal
Resestance
Full Range
Display
Resolution Accuracy
1 25 A 1 mΩ999 µΩ1 µΩ±1% rdg±1% FS
2 25 A 10 mΩ9,99 mΩ10 µΩ±0,25% rdg±0,25% FS
3 25 A 100 mΩ99,9 mΩ0,1 mΩ±0,25% rdg±0,25% FS
4 25 A 400 mΩ400 mΩ1 mΩ±0,25% rdg±0,25% FS
5 10 A 1 Ω999 mΩ1 mΩ±0,25% rdg±0,25% FS
6 5 A 2 Ω2,00 mΩ10 mΩ±0,25% rdg±0,25% FS
7 1 A 10 Ω9,99 Ω10 mΩ±0,25% rdg±0,25% FS
8 500 mA 20 Ω20,0 Ω100 mΩ±0,25% rdg±0,25% FS
9 100 mA 100 Ω99,9 Ω100 mΩ±0,25% rdg±0,25% FS
10 50 mA 200 Ω199 Ω1 Ω±0,5% rdg±0,5% FS
11 10 mA 1 kΩ1,00 kΩ10 Ω±0,5% rdg±0,5% FS
12 5 mA 2 kΩ2,00 kΩ10 Ω±1% rdg±1% FS
Note: While using RMOWin-W the result is shown with one more decimal so
that the result has ten times better resolution.

13
RMO25W Getting Started
6.6 Viewing the Test Results
Once a test is finished, RMO25W automatically changes to the Res menu to
display the test results.
Note: In case of PC and RMOWin-W software use during the test, all
performed measurements will be registered with one decimal figure
more than in Res menu.
If the defined test current could not be reached, this could be due to a
too high contact resistance of the test object and/or of the current cables.
The test current value displayed here is the maximum test current
reached.
6.7 Viewing Results of Previous Tests
RMO25W stores up to 100 test results. They can be viewed using the
Mem menu at memory positions 0 ... 99.
Go to Mem menu using LEFT, and then UP button.
Selecting a memory position on the Mem menu displays:
• the current fed into the test object,
• the memory position of these results,
• the test object’s measured resistance R1 (left channel) or R2 (right channel),
• the date or the time,
of this particular test.
To view the measured resistance R2 rather than the resistance R1, position the
cursor on the first letter of the Mem menu (here M), and use the LEFT button to
toggle between resistance R1 and R2.
To view the creation date of the test rather than the time, position the cursor on
the latest number of the memory position (here 0), and use the RIGHT button to
toggle between date and time.
Figure 6-8:
The Res menu
showing the test
results
Test current
Memory
position
that holds
the results
Measured resistances of the test objects
Figure 6-9:
The Mem menu
showing the
previously saved
test results of
memory position 40

14
RMO25W Getting Started
6.8 Printing the Test Results
RMO25W stores up to 100 test results. They can be printed using the Print menu
at memory positions 0 ... 99.
Connect the RS 232 port of the RMO25W and the printer with a serial cable.
Go to Print menu using LEFT and then UP button. Selecting first and last memory
position and press ENTER button. The results that are located in the range between
this memory locations, including the chosen memory locations, will be printed.
Seting printer, as well as look of RMO25W Test Report where given at figures
below.
Figure 6-10:
The Print menu showing
first and last memory
position and Date and
Time of printing

15
RMO25W RMOWin-W Software
7 RMOWin-W Software
RMOWin-W is a Windows program for working with Winding OhmMeters RMO-W
series. It enables the two-way communication RMO-W – PC over the serial port
RS232.
RMOWin-W supports the following functions:
- Controlling and starting RMO-W when the tests are performed from the PC;
the results could be stored to PC; results reading interval is adjustable,
- The transfer of the test parameters from the local RMO-W memory to the PC
with the possibility of writing the notes on objects being measured and
appropriate comments.
The transferred data from RMO-W is possible to:
- Display in the form of tables,
- Download as an Excel file.
Every test reading parameters contain:
- The memory location,
- The date and the time of the test,
- The real test-current,
- The measured resistance values,
- The measured voltage values,
- The name of the object (tested device) and the useful comments.
7.1 The minimum system requirements
Processor : Recommended > 500 MHz
Memory : min 32 Mb
Operating system : 95/98, NT, 2000, XP
The hard disk space : > 10 Mb
7.2 RMOWin-W installation
To install the RMOWin-W software do the following:
- Put the RMOWin-W installation CD in the CD-ROM drive,
- Click on ”Start”,
- Click on ”Run”,
- Click on ”Browse”,
- Select the CD-ROM drive,
- Highlight the ”RMOWin-W.EXE”,
- Click on ”Open”,
- Click on ”OK”,
- Follow the instructions displayed on the screen,
- When the installation process has been finished - exit the program.

16
RMO25W RMOWin-W Software
7.3 Starting RMOWin-W
Connect the RS 232 port of the RMO-W Winding OhmMeter and the PC, with a
serial cable.
Turn RMO-W on.
Start RMOWin-W:
- Click on ”Start”,
- Click on ”Programs”,
- Click on ''RMOWin-W’’,
- Click on ‘’RMOWin-W’’,
or duble click at icon on the desktop.
The look of the RMOWin-W main menu is shown in the following illustration.
If in the ”Communication” field the green led-diode and the sign ”ON” are lit, the
communication has been established and the program is ready to be used.
You can change port:
- Click on ”Tools”,
- Click on ”Choise of Comm Ports”,
- Click on the chosen port wich is not in use,
- Click on ''OK''.
If in the ”Communication” field the green led-diode and the sign ”ON” are lit, the
communication has been established and the program is ready to be used.
The illustration below depicts the main menu.

17
RMO25W RMOWin-W Software
Download
Data From RMO-W
With this command the results from the internal RMO-W memory can be transferred to
the PC. The transfer is possible only if the serial port RMO-W is connected, with the
appropriate cable, to the PC and the green led diode ”Communication” is lit (ON).
The results a user wants to transfer from the RMO-W memory to the PC are possible to
choose according to a selected criterion:
All
File
Open
Opening the file.
Save As
Saving the table in the working
directory.
Print
Printing the active table.
Exit
Exiting the program.
All the test results are being
transferred from the internal
RMO-W memory to the PC.
Memory from-up to
It opens a new window that allows
a choice of memory locations to
be transferred to the PC.
The results that are located in the
range between the memory
locations, including the chosen
memory locations, will be
transferred to the PC. The more
detailed description on how to use
the memory locations can be
found in the RMO-W manual.

18
RMO25W RMOWin-W Software
Date
Date from – up to
After choosing the wanted transfer criterion it is recommended to write the name of the
object (device) on which the tests took place as well as comments (14 character max)
that can be used in the future analysis of the results. These comments will be displayed
in the table together with the results.
The results that are filled in on the
chosen date are going to be
transferred to the PC.
After choosing this option, a new
window appears. It provides a
choice of selecting a time-interval
when the measurement was done.
The results received during the time
period between the chosen dates,
including the chosen dates, are
going to be transferred to the PC.
Current from - to
Selecting this option opens a new
window, providing a selection of
the currents that were used during
the test. The choice of the current
is made on the drop-down menu.
The range of the values that are
between and including the
selected values of the current, are
going to be transferred to the PC.

19
RMO25W RMOWin-W Software
Transfer
Stop
The results table
When the results are transferred to the PC, the table with the layout shown on the
illustration below will be displayed:
- Memory : the number of the memory location in the RMO-W in which
the test results are
- Date : the date of the test
- Time : the time of the test
- Current : the real test current
- Voltage 1 : the measured voltage on the channel 1 (Ch:1)
- Resistance 1 : the measured resistance on the channel 1 (Ch:1)
- Voltage 2 : the measured voltage on the channel 2 (Ch:2)
- Resistance 2 : the measured resistance on the channel 2 (Ch:2)
- Object : the name of the object
- Code : the code of the tested object
- Comments : comments
After pressing this key, the selected results are going to be transferred from the
internal RMO-W memory to the PC. Unless the user chooses some other option, all
the results from the RMO-W memory will be transferred (the option All is a default).
After pressing the command transfer, the graphical bar is being displayed showing a
status of the transfer.
A user should press the “Stop” button if for whatever reason he wants to
interrupt a transfer. After pressing this key all the choices are being erased and
a user will return back to the main menu.
Save
Saving the table as an Excel
file. Initially it will be
suggested to save in the
working directory.
Print
Printing the table
Exit
Returning to the main menu.

20
RMO25W RMOWin-W Software
Tools
Now the RMO-W can be controlled from the PC.
Clicking with the mouse on any key of the keyboard has the same effect as pressing the
keys on the RMO-W.
In case that the green led diode is not lit in the “Communication” window, i.e. the red led
diode is lit, it is necessary to check the following:
- Is the green led diode on the RMO-W lit?
- Is the RMO-W signaling any error?
- Is the serial cable connected tightly?
- Double-check the choice of the serial port.
Clearing of table
Erasing all the data from the main menu board.
Choise of Comm Ports
Choosing the otherPC serial port.
This window provides a choice of
the other active serial port to be
used. After a choice has been
made, the green led diode
”Communication” is going to be lit
and the same text as on the
RMO-W display is going to be
shown on the monitor.