Siemens M20 Terminal Technical Description page 205

Siemens Information and Communication Products
Coding of the green status LED
LED Status
Dark No power
Blinking Power on &
Net searching
On Power on &
registered by the net
Electrical characteristics
Voltage range for correct operation
Voltage resistance without destruction
Power cable
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
Mini SIM reader
Line-in
Line-out
V.24 interface
Max. modem cable length for correct operation
Max. handset cable length
Antenna plug
Max. RF power
Handset plug with 5V supply for electret
microphone
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.
Version 8 dated 15.03.00
Possible Error
No power supply
This status lasts longer than 1
minute after
AT+CPIN="xxxx"
-
8(-0) to 28.8(+0) volts DC,
+/- 5% ripple
0–30 V (resistant against supply voltage polarity reversal)
<3m, use external "fast"-fuse 1,25 Ampere
<200mA speech mode, <45mA idle mode
For 3 V mini SIM cards
Note: SIM cards should only be inserted and removed when the
terminal is OFF
600 Ohm (differential mode)
600 Ohm (common mode)
Double-diode protection,
150 Ohm current limiter
Length < 2 m
Length < 2 m
FME female,
Further electrical specifications (power, sensitivity, etc.) see M20
Cellular Engine
2 W at 900 MHz
Spark-gap protection
Checks & Actions
Check power supply
Check power cable pins
6-pole Western plug
pin 1: +, pin 6: GND
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
-
A
M20 Terminal
205