User manual

13
Wireless Modems — Siemens M1 Mobile Dataphone
Fig.8 Siemens M1 Mobile Dataphone
At the field end we need a device
which is a combination of a mo-
bile phone and a modem. A suit-
able device is the Siemens M1 —
it runs on 12V external DC supply,
and it has a 9–pin RS–232 inter-
face to the built-in modem which
“talks” directly to the built-in GSM
phone unit. It includes a split ca-
ble for power supply and antenna
connection.
Currently the maximum transfer
rate of this system is 9600 bits/
sec set by the network operator.
In the future the transfer rate may
increase to 19200 bits/sec (which
the M1 is designed for).
Setting up the GSM System
SIM Card
First of all you must have a GSM SIM card in order to get access to the
GSM network. Make sure that this SIM card is set up to work with NON-
TRANSPARENT DATA TRANSFER by your network operator. Note that
the phone number for data transfer may not be the same as the phone
number normally used with this SIM card. Secondly the SIM card must
not require that a PIN code be entered before use.
Siemens M1
When ordering the Siemens M1, make sure it supports NON-TRANSPAR-
ENT data transfer. This means that the M1 firmware must be version
4.02 or later. See APPENDIX 2: Software Update for Siemens M1, for
details.
Next the M1 should be programmed for autoanswer mode. To do this
connect it to your PC on COM-1 or COM-2 and start the Evaluator
software. Choose Options… from the Tools menu. Then select the Modem
tab.
From the modem droplist select User Defined Modem. Set the actual
COM-port where you have connected the M1. Finally set the Baud Rate
to 9600.
Table4 Siemens M1 Mobile Data-
phone – manufacturer’s specifica-
tions
Type M1 Nominal voltage 13.2V
Housing Plastic Input current Max. 500mA
Dimensions 116x67x30mm Class of
protection
III
Weight 157g Temperature,
operating
–20 to +55°C
Memory Flash EPROM Temperature,
storage
–40 to +70°C
Input voltage +8 to +24V Antenna
impedance
50Ω