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Java Terminals Hardware Interface Description
3.8 Power Supply
35
EHSxT_BGS5T_HID_v02 2014-05-23
Confidential / Preliminary
Page 31 of 70
Emergency restart:
• In the event of software hang-ups etc. the Java Terminals can be restarted by applying a
voltage >8V to the RST_IN pin (pin 3) for more than 10ms.
The RST_IN signal restarts the Java Terminals.
Caution: Use the RST_IN pin only when, due to serious problems, the software is not
responding for more than 5 seconds. Pulling the RST_IN pin causes the loss of all informa-
tion stored in the volatile memory since power is cut off immediately. Therefore, this proce-
dure is intended only for use in case of emergency, e.g. if Java Terminals fails to shut down
properly.
Watchdog shutdown:
• The watchdog can also be configured to turn the Java Terminals off.
When the Java Terminals enter the POWER DOWN mode, e.g. after you have issued the
AT^SMSO command or activated the RST_IN signal, all RS-232 interface lines are active for
a period of 50ms to max. 3.5s. This may cause undefined characters to be transmitted on the
RS-232 lines which can be ignored.
3.8.4 Disconnecting power supply
Before disconnecting the power supply from the PLUS pin, make sure that the Java Terminals
are in a safe condition. The best way is to wait 1s after the "^SHUTDOWN" result code has
been indicated.
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