Operating instructions

ManualsBrandsDigiPos ManualsComputer equipmentDS-810

Option

2-71380

The

HI

level

prevents

mainframe

switching

commands

from

affecting

the

X-Y

display

.

This

same

HI

level

is

coupled

through

the

Lockout

Buffer

Amplifier

(Q201,

Q202,

and

Q206

on diagram

3) to

the

lockout

input

at

U220-pin

18,

to

cause

a

trigger

disable

level

at

U220

pin

17

thereby

dis-

abling

the

sweep

.

X-Y

LOGIC

.

In

the

X-Y

mode,

Q962

is

turned

on

and

its

collector

becomes

LO

.

This

LO

level

is

applied

to

the

base

of

Q372

in

the

Sweep

Gate Generator

(diagram

4) to

turn

it

off

and

to

maintain

the

LO

state

of

the

generator

.

The

Sweep

Gate

Generator

is

thereby

effectively

disabled

in

this

mode

.

The

resultant

H

I

at

the

collector

of

Q372

is

coupled through

emitter

follower

Q382

to

the

mainframe

to

keep

the

crt

display

unblanked

at

all

times

.

Option

2-Page

6

READOUT

INHIBIT

.

In

the

X-Y

mode,

the

Readout

In-

hibit

level

at

interface

connector

A37

is

held

HI

.

This

pre-

vents

the

mainframe

readout

circuitry

from

producing

a

readout

display

from

the

mainframe

plug-in

compartment

containing

the

Option 2

Time

Base

.

X-Y

COMPENSATION

.

In

the

X-Y

mode,

the

X-Y

Com-

pensation

level at

interface

connector

B10

is

held

LO

.

This

allows

a

compensation

network

to

be

switched

into

the

main-

frame

horizontal

signal

path

for

X-Y

compensation

(only

if

the

mainframe

contains

optional

X-Y

compensation

cir-

cuitry)

.