Echelon Excel 50 Installation Instructions Manual - page 31
EXCEL 50 INSTALLATION INSTRUCTIONS
31
EN1B-0101
Fig. 54. Directional Antenna (YAGI), 12 DBi.
Fig. 55. Round Radiation Antenna, 6.5 DBi.
Fig. 56. Window Patch Antenna, 2 DBi.
GSM Antenna Installation
The maximum antenna cable length is 8.0 m (including the
20-cm M20 Terminal cable). Use a cable that is specified by
the supplier of the GSM antenna. Improper cables with re-
sistances that are too high will reduce the antenna's ampli-
fication.
• Ideally you should know in which direction the next GSM
station is located in order to position of the antenna
accordingly.
• The easiest way to check the signal quality is to operate a
cellular (mobile) phone at the very place where you want
to place the antenna.
—
The cellular phone must operate in the same GSM
network as the M20T.
—
Drop-outs in voice communication indicate that the
reception is too weak. The data communication will
never work where you have drop-outs in voice com-
munication with the cellular phone. The preferred
way is to set-up the M20T on a terminal program and
check the reception with the SIEMENS AT com-
mands – see the M20T handbook.
—
An alternative way to verify the signal quality is to
use the terminal program on the CD supplied with
the M20T. You will find a special button on it that
allows checking on the signal quality.
• Dipole antennas (e.g. antennas with a magnetic foot) must
sit on metal ground to achieve the specified amplification.
The larger the metal ground, the better.
• The antenna must be mounted vertically, NOT horizontal-
ly.
• Avoid barriers for the antenna signal. Ideally, within a
range of approximately 3 meters, there should not be any
vertical barriers that would block the antenna signal, such
as doors, PCs, cupboards, etc.
• Select the most suitable antenna. Location and mounting
limitations may require that special antennas be used,
such as antennas with higher amplification or directional
antennas.
• Avoid loose contacts. All connections from the M20T to
the antenna must be tight.
• Increase the distance between the antenna and Excel
CPU if you experience electromagnetic interference of the
antenna signal to the CPU. An indication of this might be
that the functioning of the MMI of the CPU is disturbed or
that the outputs behave abnormally.
M20 Terminal Set-up
Prior to beginning the set-up, get the M20T manual (or CD-
ROM, if it was delivered with one). Everything is described in
it and you will need it.
IMPORTANT
It is absolutely mandatory to use a serial data line
monitor for the set-up of the M20T. Without such a
device being connected between the serial port of
the PC and the M20T, you will get no information on
the set-up process.
1. Insert the SIM card into the M20T.
2. Connect the serial cable to the M20T and a PC or
laptop.
3. Connect the antenna cable and antenna to the M20T
connector.
4. Start a terminal program, e.g., Windows™
HyperTerminal
5. Connect the power supply to the M20 Terminal and
plug into mains.
The M20T LED will be blinking now.
6. Set terminal program to 19200 baud.
7. Verify the correct operation of the M20T serial interface
by entering: AT.
The M20T will respond: OK.
8. Change the M20T’s baud rate from 19200 (factory
default) to 9600: AT+IPR=9600.
9. Set terminal program back to 9600 baud.
10. Command the M20T to cut the line whenever the DTR
signal is dropped (OFF) or toggled ON/OFF: AT&D2
11. Store setting in nonvolatile memory: AT&W.