RAD Data comm ASMi-52 manual DTE Interface Connectors, 35, X.21 and RS-530 Interface Connectors

Appendix A

Interface Connector

Specifications

A.1 DTE Interface Connectors

V.35, X.21 and RS-530 Interface Connectors

The V.35 interface of the ASMi-52 modem terminates in a 34-pin female connector. The X.21 interface terminates in a 15-pin, D-type female connector. The RS-530 interface terminates in a 25-pin, D-type female connector. Table A-1lists the pin assignment of the V.35, X.21 and RS-530 interface connectors.

Table A-1. V.35, X.21 and RS-530 Connector Pinouts

Signal

V.35

RS-530

X.21

Description

Function

34-Pin

DB-25

DB-15

Pin

Circuit

Pin

Circuit

Pin

Circuit

(Function)

Protective

A

Frame 101

1

1

----

Chassis Ground. It may be

Ground

(Shield)

isolated from Signal Ground.

Signal

B

Signal 102

7

AB

8

----

Common signal and DC power

Ground

GND

(GND)

supply ground.

Transmitted

P

TD(A) 103

2

BA(A)

2

T(A)

Serial digital data from DTE. In

Data

S

TD(B) 103

14

BA(B)

9

T(B)

sync applications, the data

translations must occur on the

(Transmit)

rising edge of the transmit clock.

Received

R

RD(A) 104

3

BB(A)

4

R(A)

Serial output from the modem

Data

T

RD(B) 104

16

BB(B)

11

R(B)

receiver. In sync applications,

(Receive)

the data translations occur on

the rising edge of the clock.

Request to

C

RTS 105

4

CA(A)

3

C(A)

A positive level to ASMi-52

Send

19

CA(B)

10

C(B)

when data transmission is

required.

(Control)

Clear to Send

D

CTS 106

5

CB(A)

A positive level from

13

CB(B)

ASMi-52 with delay, after

receipt of Request to Send, and

when ASMi-52 is ready to

transmit.

ASMi-52 Ver. 2.5 DTE Interface Connectors A-1