SP503AN

SP503 Application Note

© Copyright 2000 Sipex Corporation

5

Driver / Receiver Connections to a DB-25 Connector

DCE Mode

TxD Drivers

Receivers

DTR

RTS

14

13

16

15

TxC

SP503CF

RxD

RxC

CTS

DSR

DCD

1

20

80

78

19

RI

21

SCT

79

17

RL

24

LL

ST

22

Female

Connector

to pin 22 for non-RS-232

TxD(A)

TxD(B)

TxC(A)

TxC(B)

RTS(A)

RTS(B)

DTR(A)

DTR(B)

LL

RL

RxD(A)

RxD(B)

DSR(A)

CTS(A)

CTS(B)

RxC(A)

RxC(B)

SCT(A)

SCT(B)

RI

DCD(A)

DCD(B)*

49

51

45

47

44

42

65

63

52

54

58

59

61

39

35

69

68

67

37

70

71

38

66

36

40

76

77

56

* The non-inverting LL driver output is not a

valid driver output for RS-449 and EIA-530.