If you are interfacing a DCE device to a DTE device, you must use a one-to-one straight cable as shown in Figure 2. If you are interfacing a DCE device to a DCE device, or a DTE device to a DTE device, you must use a crossed cable as shown in Figure 3. Input handshaking lines are enabled if nothing is connected, allowing the system to operate with only Tx, Rx and GND connected.

500H MODEL - DCE

 

 

 

DTE DEVICE

MALE DB-25

 

 

 

 

FEMALE DB-25

1

PGND

 

 

PGND

1

2

TXD

<

 

TXD

2

3

RXD

 

>

RXD

3

4

RTS

<

 

RTS

4

5

CTS

 

>

CTS

5

6

DSR

 

>

DSR

6

7

SGND

 

 

SGND

7

8

DCD

 

>

DCD

8

20

DTR

<

 

DTR

20

Figure 2 - 500H Series (DCE) to DTE Device

500H

MODEL

- DCE

DCE DEVICE

MALE

DB-25

 

FEMALE DB-25

2

TXD

TXD

2

3

RXD

RXD

3

4

RTS

RTS

4

5

CTS

CTS

5

6

DSR

DSR

6

7

SGND

SGND

7

8

DCD

DCD

8

20

DTR

DTR

20

Figure 3 - 500H Series (DCE) to DCE Device

10

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Bay Technical Associates 525H, 5218H, 528H, 529H owner manual 500H Series DCE to DTE Device