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DSB75 Development Support Board Rev. B1 Hardware Description

Strictly confidential / Released

DSB75_hd_v08 Page 29 of 94 29.09.2005

3.5 RS-232 Interfaces

The DSB75 offers three asynchronous RS-232 interfaces:

• COM1 (ASC0)

• COM2 (ASC1)

• COM3 (ASC2)

The status of all interface lines is indicated by LEDs (refer to section 4).

For using ASCx lines on the test pins X101, X102 without the DSB75 level converter please

disable receiver outputs by removing jumpers X204 and X206.

Figure 11 shows the simplified interface schematic. Figure 12 shows the placement of the D-

sub connectors, switches, jumper and the pin location. Electrical characteristics are specified

in section 7.

RXD0

TXD0

RTS0,DTR0

S200

S201

D200

IGT

PWR_IND

B2B

X100

200

CTS,DSR, DCD,

RING

RXD

TXD

RTS,DTR

9 pole D-sub

X201

8,6,1,9

7,4

GND

USC1

USC2

RS232

level converter

D201

200

2 2

TXD, RTS

TXD

9 pole D-sub

X202

GND

200

RXD

9 pole D-sub

X205

GND

RXD1, CTS1

RXD, CTS

TXD1, RTS1

RXD2_GPIO9

TXD2_GPIO10

S458

S459

S302,306

S303,307

S301,305

S300,304

2,8

3,7

RS232

level converter

V420

52,48,54,47

49,50

29,53

31,51

3V0

PWR_IND

LED indication (0=on, 1=off)

d/dt

COM1 (ASC0)COM2 (ASC1)

COM3 (ASC2)

X203

DTR

CTS0, DSR0,

DCD0, RING0

ASC_SD

X204

PWR_IND

ASC_SD

X206

PWR_IND

ASC_SD

V200

Figure 11: RS-232 interfaces

1 2 ... 24 25 26 27 28 29 30 31 32 33 34 ... 93 94

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