EXCEL 500/600 INSTALLATION INSTRUCTIONS
GSM Antenna Installation
The maximum antenna cable length is 8.0m (including the 20
cm M20 Terminal cable). Use a cable that is specified by the
supplier of the GSM antenna. Improper cables with
resistances that are too high will reduce the amplification of
the antenna.
• 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
communication with the cellular phone. The pre-
ferred way is to set-up the M20T on a terminal
program and check the reception with the SIEMENS
AT commands – see the M20T handbook.
— An alternative way to verify the signal quality is to
use the terminal program on the CD that is 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 horizontally.
• 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.
12. You may now enter the PIN number or let the Excel
CPU do this. If you want to enter the PIN number now,
enter the PIN with the command AT+CPIN=”xxxx”,
where xxxx represents the PIN number.
NOTE: Regarding the PIN entry, the M20T shows the same
behavior as a regular cellular phone, as it uses the
same type of SIM card. This means, for example,
that after 3 false PIN inputs, the SIM card will lock
and need to be released via the “PUK” Personal
Unlocking Key (Master PIN).
Repeated input of the wrong “PUK” (more than 2
false inputs) will destroy the SIM card irrevocably.
13. Once the M20 has accepted the PIN it will log into the
GSM net.
The terminal window will show “OK”.
The M20T LED will be on continuously.
14. Disconnect the serial cable from the PC/laptop and
connect it to the Excel CPU.
15. Verify that the M20T dials out on the telephone number
for data communication, otherwise, its call will not be
recognized by the XBS. The M20T can be forced to do
so by adding the letter <i> to the telephone number,
e.g.<ATDi1234567891234>
47 EN1R-1047GE51 R0702