Maestro A2200-A Bedienungsanleitung PDF herunterladen (Seite 15)

V1.0 – Aug-13

User’s Manual

Page 15 of 37

NOTE: It is recommended to supply Vcc continuously! Use SiRFaware

other low power modes to reduce power consumption of the module while no

position information is required.

 External antenna input impedance is 50 . Match as close as possible.

 Maximum allowed external antenna current is 50 mA. Consider a current li-

miter.

For completeness the following picture shows 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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