RAD Data comm ASMi-31 operation manual Unassigned pins according to X.21 standard

ASMi-31Installation and Operation ManualAppendix D. DTE Interface Connectors

Table D-1

DTE Interface Signal Assignments (Cont.)

RS-232

V.35

EIA-530

X.21

Signal

DB-25

DB-25

34-pin

DB-25

DB-25

DB-15

Description

Function

Stand-

Frame

Standalone

Standalone

Frame

Standalone

alone

and Frame

and

Pin Circuit/

Frame

Pin Circuit

Pin Circuit

(Function)

External

24

19

U SCTE(A)

113

24

DA(A)

24

7

(A)*

A serial data

Transmit

16

W SCTE(B) 113

11

DA(B)

11

14

(B)*

rate clock input

Clock

from the data

source. Positive

clock

transitions must

correspond to

data transitions.

Transmit

15

14

Y

SCT(A)

114

15

DB(A)

15

6

S(A)

A transmit data

Clock

10

A

SCT(B)

114

12

DB(B)

12

13

S(B)

rate clock for

[SIGNAL

use by an

TIMING]

external data

source. Positive

clock

transitions

correspond to

data

transitions.

Receive Clock

17

22

X

SCR(B)

115

17

DD(A)

A receive data

23

V SCR(A)

115

9

DD(B)

clock output

for use by

external data

sink. Positive

clock

transitions

correspond to

data

transitions.

Local Analog

18

18

L and j

141

18

LL

A control signal

Loop

input; when

on, commands

ASMi-31 into

Local Analog

Loopback

(V.54 Loop 3).

See Table 2-1.

Note

* Unassigned pins according to X.21 standard.

General D-3

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