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M20 Terminal
Version 8 dated 15.03.00
205
Siemens Information and Communication Products
Coding of the green status LED
Electrical characteristics
Note
: Voltage supply: Voltage supply on connection must NOT rise faster than 3V/msec.
IMPORTANT:
To protect to device against high voltage (>32V) a 1.25A quick-break fuse on pin 1 of the 6-pole Western plug shall be
used. For use with power packs and batteries observe the EN60950 guidelines. Installation and start-up may only be per-
formed by authorized persons.
LED
Status
Possible Error
Checks & Actions
Dark
No power
No power supply
Check power supply
Check power cable pins
6-pole Western plug
pin 1: +, pin 6: GND
Blinking
Power on &
Net searching
This status lasts longer than 1
minute after
AT+CPIN="xxxx"
Check if SIM card is
inserted
Check if antenna cable is
correctly connected to FME plug
Check if antenna is correctly
positioned
Check if M20 IGNITION at Western
plug has been set to logical high and Pin
3 of the 6-pole Western plug is applied
with less than 4V DC
On
Power on &
registered by the net
-
-
Voltage range for correct operation
8(-0) to 28.8(+0) volts DC,
+/- 5% ripple
Voltage resistance without destruction
0–30 V (resistant against supply voltage polarity reversal)
Power cable
<3m, use external "fast"-fuse 1,25 Ampere
Current consumption at 12V: Stand-by state (voltage
is applied, ignition not yet asserted) I =/< 0.2 mA idle
mode: I < 60 mA average call in progress: peak: I <
2 A. (pulsed t = 577ms, at T = 4.615ms), arithmetic
mean: I < 275 mA
<200mA speech mode, <45mA idle mode
Mini SIM reader
For 3 V mini SIM cards
Note: SIM cards should only be inserted and removed when the
terminal is OFF
Line-in
600 Ohm (differential mode)
Line-out
600 Ohm (common mode)
V.24 interface
Double-diode protection,
150 Ohm current limiter
Max. modem cable length for correct operation
Length < 2 m
Max. handset cable length
Length < 2 m
Antenna plug
FME female,
Further electrical specifications (power, sensitivity, etc.) see M20
Cellular Engine
Max. RF power
2 W at 900 MHz
Handset plug with 5V supply for electret
microphone
Spark-gap protection