SP506 datasheet(2/30 Pages) SIPEX

2 / 30 page

SP505/6/7APN/03

SP505, SP506, SP507 Application Note

DTE Configuration to a DB-25 Serial Port

The SP505, SP506 and SP507 can easily be configured

as a DTE in all serial communication applications.

The SP505, SP506 and SP507 contain seven drivers

and seven receivers to support most of the signals

required for proper serial communications. Figure 1

summarizes the usual signals used in synchronous

serial communications. The basic configuration shown

in Figure 2 illustrates a connection to a DB-25 D-sub

connector commonly used for EIA-530 and RS-232.

For other serial interface protocols, the decoder

can be used to select the physical layer interface.

The DEC

0-3 of the SP505 and SP506 will program its

internal drivers and receivers to electrically adhere to

the appropriate interface. The SP507 decoder is

slightly different and uses 3-bits to select the desired

interface. For the appropriate physical connection,

a "daughter" cable can be attached to the DB-25

connector (female pins on cable) and transfer the

signals to the physically compliant connector.

For example, a V.35 interface will have a ISO-2593

34-pin connector. For a V.35 DTE interface, the

SP505, SP506 and SP507 can be programed to V.35

mode and a daughter cable, having a DB-25 female

connector on one end and a V.35 34-pin male

connector on the other end, will allow the equipment

to have an electrically and physically complaint V.35

interface.

Figure 1. Signals and Connector Allocation Table

EIA-232

EIA-530

EIA-449

Signal Name

Source Mnemonic Pin Mnemonic Pin Mnemonic Pin

Shield

—

Transmitted

Data

DTE

BA (A)

SD (A)

BA (B)

SD (B)

Received

Data

DCE

BB (A)

RD (A)

BB (B)

RD (B)

Request To Send

DTE

CA (A)

RS (A)

CA (B)

RS (B)

Clear To Send

DCE

CB (A)

CS (A)

CB (B)

CS (B)

DCE Ready (DSR)

DCE

CC (A)

DM (A)

CC (B)

DM (B)

DTE Ready (DTR)

DTE

CD (A)

TR (A)

CD (B)

TR (B)

Signal Ground

—

Recv. Line

Sig. Det. (DCD)

DCE

CF (A)

RR (A)

CF (B)

RR (B)

Trans. Sig. Elemt.

Timing

DCE

DB (A)

ST (A)

DB (B)

ST (B)

Recv. Sig. Elemt.

Timing

DCE

DD (A)

RT (A)

DD (B)

RT (B)

Local Loopback

DTE

Remote Loopback

DTE

Ring Indicator

DCE

—

Trans. Sig. Elemt.

Timing

DTE

DA (A)

TT (A)

DA (B)

TT (B)

Test Mode

DCE

V.35

Mnemonic

—A

103

104

105

106

107

108

H *

102

109

114

115

141

L *

140

N *

125

J *

113

U *

113

W *

142

NN *

X.21

Mnemonic

—1

Circuit T(A)

Circuit T(B)

Circuit R(A)

Circuit R(B)

Circuit C(A)

Circuit G

Circuit C(B)

Circuit I(A)

Circuit I(B)

* - Optional signals

** - Only one of the two X.21 signals, Circuit B or X, can

be implemented and active at one time.

Circuit X(A)**

Circuit X(B)**

Circuit S(A)

Circuit S(B)

Circuit B(A)**

Circuit B(B)**

X.21 Connector (ISO 4903)

DTE Connector — DB-15 Pin Male

DCE Connector — DB-15 Pin Female

RS-449 Connector (ISO 4902)

DTE Connector Face — DB-37 Pin Male

DCE Connector Face – DB-37 Pin Female

RS-232 & EIA-530 Connector (ISO 2110)

DTE Connector — DB-25 Pin Male

DCE Connector — DB-25 Pin Female

NN JJ DD Z

MM HH CC Y

LL FF BB X

KK EE AA W

V.35/ISO 2593 Connector

DTE Connector Face — 34 Pin Male

DCE Connector Face — 34 Pin Female

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