Siemens TC35i User Manual download pdf (Page 19)

TC35i Terminal Hardware Interface Description

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TC35i_T_HD_v01.05 Page 19/37 10.07.2003

Table 4: Female 6-pole Western plug for power supply, ignition, power down

Pin Signal Name Use Parameters

1 PLUS Power supply 8V – 30V DC, max. 33V for 1 min

2 free --- ---

3 PD_IN Signal for power down mode U

>5V for t > 3.5s to switch the terminal off,

<2V for normal operation

4 IGT_IN Ignition

>5V

Ignition > 5V for more than 200ms switches

the terminal on

5 free --- ---

6 GND Ground 0V

The ignition is activated only by a rising edge. The rise time is <20ms.

The IGT_IN signal switches the terminal on (it changes from power down state to the net searching state).

Note :

· Power off exception handling: In the event of software hang-ups etc. the TC35i Terminal

can be switched off by applying a voltage >5V to pin 3 (PD_IN) for more than 3.5s.

To switch on again you have two options: Activate the ignition pin (IGT_IN pin 4) or

switch on the RS-232 DTR line, during /PD_IN not active (pin 3 voltage <2V).

The /PD_IN signal switches the terminal off. All internal supply voltages are off, except

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

3.5.2 for use of the RTC.

· For all other operating modes the /PD_IN signal must be low (<2V).

· When the TC35i Terminal is switched off or 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 undefined during internal power shutdown process. This may cause

undefined characters which can be ignored.

· In order to properly shut down the TC35i Terminal be sure to wait 10s after sending

AT^SMSO before switching off the power supply at pin PLUS. This time is needed for

the module to safely log off from the network and finish saving to the internal memory.

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

TC35i Terminal fails to shut down properly.

3.5.1.1 Maximum number of turn/on & turn/off cycles

Each time the TC35i Terminal is shut down, data will be written from the volatile memory to

flash memory. The guaranteed maximum number of write cycles is limited to 100.000.

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Siemens TC35i User Manual Page 19