MGP WRM2 Spécifications télécharger pdf (Page 23)

TelePole WR/ Operating & Maintenance Manual Page 23

Speaker Circuit (U13)

The speaker circuit is activated in the following cases:

a. Threshold level exceeding.

b. Malfunction.

c. Push-button pressing approval.

d. The speaker clicks frequency is proportional to the radiation field intensity.

A 3 KHz signal on pin U13/3 activates the speaker. Two ports control the speaker:

Port 1 - alarm, pin U3/9

Port 2 - speaker on, pin U3/19

For threshold level exceeding and malfunction:

U3/9 - “0”

U3/19 -

1sec 1sec

For push-button pressing approval:

U3/9 - “0”

U3/19 -

100msec

For clicks activation in relation to the radiation field intensity:

U3/9 - “1”

U3/19 - “1”

To mute the speaker:

U3/9 - “0”.

U3/19 - “1”

Input & Output Latch

Two 74HC373 IC‘s are used for the input/output signals. The IC’s are connected to the

CPU BUS.

Input signals - U9, address - 8200H

Output signals - U3, address - 8100H

Output Signals

0 - U3/2 external/internal detector (optional)

1 - U3/5 low range / high range geiger

2 - U3/6 Electro-luminescence

3 - U3/9 speaker alarm

4 - U3/12 not in use

5 - U3/15 not in use

6 - U3/16 enables VCC for barcode laser reader

7 - U3/19 speaker on

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MGP WRM2 Spécifications Page 23