M20 Terminal
Version 8 dated 15.03.00 203
Siemens Information and Communication Products
A
9.1.2 Mechanical characteristics
Note: the M20 Terminal shall not be used within wet environment, such as showers, bath.
9.2 Electrical description and interfaces
M20 Terminal has following plugs for power supply, interfacing and antenna:
• 6-pole Western plug (female) for power supply, ignition signal and audio-line-in/out-signal
• 4-pole Western plug (female) for connecting a handset
• 9-pole (female) SUB-D plug for V.24/V.28 serial interface
• 20 cm antenna cable with FME plug (female)
6-pole Western plug (female)//power supply, ignition, line-in/out
Note
:
(1) Ignition signal has to be set > 5V for longer than 1 s, remember that this signal has to be low when switching off the
M20 with AT command AT^SMSO, see Chapter
5.7 “Siemens-defined AT commands for enhanced functions” on page 111.
(2) SW-DOWNLOAD: To switch the M20T to bootmode use the following procedure:
Apply > 8V to Pin 5 before or together with the supply voltage. The M20T switches to bootmode. Proceed according to
capt.8.5 (e.a.?) loading the SW using the RS 232-interface (9-pole SUB-D plug).
(3) POWER_OFF EXCEPTION HANDLING: In case of software hang-ups etc. the M20T can be switched off using the
following procedure (exception handling): Pin 3 must be applied with a voltage > 8V AND Pin 4 must be low (0V). To
switch on again, set ignition >5V (and Pin 2 <2V).
Fig. 9-2 Front view of Western plug 6-6 (male)
Weight 145 g
Dimensions (max) LxWxH = 107.0 x 63.5 x 31.3 mm
Temperature range -20°C - 55 °C
Protection class IP40 (see Notice)
Mechanical vibrations Amplitude 7.5 mm at 5-200 Hz sinus
Max. pulse-acceleration 30g pulse with 18 ms duration time
Air humidity 5–98%
Pin Usage
1 Power supply 8-28.8 V
2 Audio Line Ground (for pin 3/AC:in & pin 5/AC:out)
3 (This Pin must not exceed Voltages >2V
to avoid power switched off!)
AC: Line-in input 600 Ohm
DC: Signal for power Off, power off for U (to pin6) >8V (ignition
low)
4 Ignition > 5V for longer than 1 s switches
on
Ignition signal (see M20: 80-pole connector Pin 8)
Ignition for U (to pin 6) >5V
5 (This Pin must not exceed Voltages >2V
during power on procedure to avoid a
change to bootmode!)
AC: Line-out 600 Ohm
DC: Signal for initialisation of SW download for U(to Pin6)>8V
6 GND
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