Service Information - Siemens M20 Terminal Technical Description

Siemens Information and Communication Products
8.8.7 Reset: Deadlock handling
The following sequence describes the method to reset the M20 in case there it no longer reacts to AT-commands. Cutting
the power supply is not necessary.
Shutting down must be done in two steps:
IGNITION (PIN 8 on the 80pole SMD connector) must be set to TTL-low(<0.8V)
POWER_ON (PIN 74 on the 80pole SMD connector) must be set to TTL-LOW. (see Fig. For circuit example)
8.9

Service information

In the event of M20 malfunction, please contact your distributor. For a list of distributors, see
Version 8 dated 15.03.00
POWER_ON (Pin 74)
1..4,7kOhm
This is a sure method to power
down the M20 without causing
any faults or errors. Even if the
IGNITION is accidentally left on
M20
HIGH, no damage is caused to the
unit.
Application notes
.
See "1 Overview"
A
201