Siemens MC35 Specifications download pdf (Page 21)

MC35i Terminal Hardware Interface Description

Confidential / Released

MC35i_T_HD_v02.00a Page 21 of 42 16.02.2007

3.5.1.1 Turn MC35i Terminal on

The IGT_IN signal (pin 4) switches the MC35i Terminal on. After start-up, the MC35i

Terminal enters the net searching state. The IGT_IN signal is activated when an appropriate

power supply unit is plugged to the 6-pole Western jack.

While the PD_IN pin (pin3) is not active (voltage <2V) you can start the MC35i Terminal by

activating the RS-232 DTR line.

3.5.1.2 Reset MC35i Terminal

An easy way to reset the MC35i Terminal is entering the command AT+CFUN=x,1. For

details on AT+CFUN please see

[1].

As an alternative, you can shut down the MC35i Terminal as described in Section

3.5.1.3

and then restart it as described in Section

3.5.1.1.

3.5.1.3 Turn MC35i Terminal off

Normal shutdown:

• To turn off the MC35i Terminal use the AT^SMSO command, rather than disconnecting

the mains adapter.

This procedure lets the MC35i Terminal log off from the network and allows the software

to enter a secure state and save data before disconnecting the power supply. After

AT^SMSO has been entered the MC35i Terminal returns the following result codes:

^SMSO: MS OFF

^SHUTDOWN

The "^SHUTDOWN" result code indicates that the MC35i Terminal turns off in less than

1 second. After the shutdown procedure is complete the MC35i Terminal enters the

POWER DOWN mode. The green status LED stops flashing (see Section

3.5.6 for a

detailed LED description). The RTC is still fed from the voltage regulator in the power

supply ASIC.

Emergency shutdown:

• In the event of software hang-ups etc. the MC35i Terminal can be switched off by

applying a voltage >5V to the PD_IN pin (pin 3) for more than 3.5s.

The PD_IN signal switches the MC35i Terminal off. All internal supply voltages are off,

except for the power down voltage, which still feeds the real-time clock (RTC).

Caution: Use the PD_IN pin only when, due to serious problems, the software is not

responding for more than 5 seconds. Pulling the /PD pin causes the loss of all

information stored in the volatile memory since power is cut off immediately. Therefore,

this procedure is intended only for use in case of emergency, e.g. if MC35i Terminal fails

to shut down properly.

When the MC35i Terminal enters the POWER DOWN mode, e.g. after you have issued the

AT^SMSO command or activated the PD_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.

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Siemens MC35 Specifications Page 21

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