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Null Modem Cable Architecture (Windows Embedded CE 6.0)

1/5/2010

The following table shows the required hardware for a serial port connection.

Requirement Description

Null modem cable

A type of serial cable used for obtaining standard debug messages.

The following table shows the pin settings for a 9-pin null modem cable.

Data Terminal Equipment (DTE) Data Communications Equipment (DCE) Label

1, 6

4

CD, DSR - DTR

2

3

RD - TD

3

2

TD - RD

4

1, 6

DTR - CD, DSR

5

5

Gnd - Gnd

7

8

RTS - CTS

8

7

CTS - RTS

Ee478296.note(en-US,WinEmbedded.60).gifNote:
9 is NC on both ends.

The following table shows the pin settings for a 25-pin null modem cable. RTS and CTS are crossed to support hardware flow.

DTE DCE Label

2

3

TD - RD

3

2

RD - TD

4

5

RTS - CTS

5

4

CTS - RTS

6, 8

20

DSR, DCD - DTR

7

7

Gnd - Gnd

20

6, 8

DTR - DSR, DCD

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