Maestro A2100-A Bedienungsanleitung PDF herunterladen (Seite 15)

V1.3 – Jul-12 User’s Manual Page 15 of 32

NOTE: Care must be taken to implement an orderly shut-down sequence along

with supplying power for a certain period of time after initiating the shut-down

sequence. Abrupt removal or drop of power while the module is running has

risks ranging from minor impact on TTFF to fatal corruption of flash memory

code area (Please refer to “Power ONOFF Sequences and Power-On-Reset

(POR) on A2100-AB Application Notes”)!

For completeness the following pictures show the use of an RS232 level shifter.

GND

0.1µF

RS232 Level Shifter

RS232 Out

DB9 female

3.3V

Vcc

GND

T1O

R1I

R1O

T1I

T2I

R2O

C1+

V+

C1-

C2+

C2-

V-

T2O

R2I

MAX3232

GND

0.1µF

RS232 Level Shifter

RS232 Out

DB9 female

3.3V

Vcc

GND

T1O

R1I

R1O

T1I

T2I

R2O

C1+

V+

C1-

C2+

C2-

V-

T2O

R2I

MAX3232

Figure 6: RS232 level shifter for minimum configurations

Remarks:

• Place C1 to C5 (here: 0.1µF) close to MAX3232. For capacity values see

datasheet of actual component used.

• Use 3.3V level shifter (MAX3232 or equivalent).

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