CashCode ST-07 Series Panduan Pengoperasian - Halaman 9

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8.2. CashCode

Serial Interface

The input and output circuitry belonging to this interface are shown on the figure below. They

have the following specifications:

1. The output:

- open collector type

- open transistor leakage current is not greater than 0.1 mA with applied voltage up to 20 VDC;

- closed transistor collector-emitter voltage is not more than +0.6 VDC with current up to 100

mA.

2. The input:

- logic «0» state input voltage is not more than +0.5 VDC with sinking current up to 5 mA;

- logic «1» state input voltage is not less than +4.5 VDC with sourcing current up to 0.1 mA.

The output circuitry is compatible with any of the input circuitry of the external equipment

based on TTL, HC, HCT gates levels. To guarantee a reliable logic «1» state output signal, the

external equipment should have a pull-up resistor with resistance within 1 kOhm... 4.7 kOhm.

The input circuitry can be connected directly to the output of components such as TTL, HC,

HCT series of the external equipment. On top of this, any component of the external

equipment can provide the input signal within the specs for the input circuitry.

VALIDATO R

Input

C P U In

O utput

C P U O u t

LED Pow er Source

PT# MAN-ST07 Rev.B2 11/99

+ 5 vD C

4 .7K

1 K

4 .7K

+ 5 vD C

2 00 o hm

EQUIPM ENT

Vo l= 0 .8 v or le ss

+ 2 0V D C m a x

Io l= 2m A ...10 0m A

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