Siemens ET7 Series Dokumentacja Pobierz pdf (Strona 33)

DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 33 of 94 29.09.2005

As the X202 interface has only four lines, you may need a customized adapter cable for the

RS-232 connection. This is useful, for example, if your application also requires the lines

DSR, DCD, RING. In such a case it is recommended to use the following pin assignment:

9 pole Sub-D

on PC side

(female)

9 pole Sub-D

on DSB75 side

(male)

2 RXD

3 TXD

5 GND

7 RTS

8 CTS

DCD

RXD

TXD

DTR

GND

DSR

RTS

CTS

RING

Figure 13: Recommended adapter cable from PC to COM2 on DSB75

3.5.3 Debug Interface (COM3)

The debug interface COM3 (X205) of the DSB75 is reserved for Siemens internal software

debugging. It is a two wire interface with data lines only.

A level converter D201 adapts and inverts the V.24 signals (2.9V level) from the GSM

module to RS-232C level.

The output lines are switched off (high impedance) if the GSM module is in POWER DOWN

mode.

The ASC2 lines of the GSM module are used by default as GPIOs (see section 3.3)

Table 11: Pin assignment of debug interface COM3 (X205)

Pin Name I/O Description X100 signal

name

Config.

switches

Remark

2 RXD O Receive Data RXD2_GPIO9 S458:1

3 TXD I Transmit Data TXD2_GPIO10 S459:1

5 GND - Ground GND

1, 4, 6,

7, 8, 9

nc= not connected

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 93 94

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