Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 28)

RPBASIC-52 PROGRAMMING GUIDE

2-9

CARD$

Syntax: CARD$(expr)

Where: expr = 0 to 3, is the card reader to scan.

Function: Checks card reader for data. If present, returns the site code and card number. If no data is present,

an error code described below is returned. All data is return ed in a string form at.

Mode: Run

Use: $(0) = CARD$(N)

Cards: RPC-52, RPC-320, RPC -330

DESCRIPTION

CAR D$ returns eithe r the site code and card num ber or an error code . The site code and card num ber is

returned in the following format:

"SSS-NNNNN"

Site codes and card numbers have lead ing 0's. The '-' character is used a s a separator.

There are 4 different kinds of error returns possib le. These errors are always in a 2 c haracter "-X" format.

'X' is a number with the following meanings:

1 No card number present

2 Hardware error - both data bits down

3 Parity error

4 Timeout error - some data received

A "-1" return is the most common. It indicates no card was swiped. A "-3" error indicates the card was

improperly swiped.

This comm and w as designed to work with Sensor Engineerin g Co. (P hone 2 03 777 7444) m odel no 31503.

Cards are in a 26 bit format: 2 check sum, 8 site code, 16 data.

Up to 4 card readers may be connected to the digital port at J3. Ports A and B are used to read and control the

readers. Port C m ay be used for additional opto or digital I/O. Port A must be configured as an input and po rt

B an output using the CONFIG LINE 100. . . statement. Port C may be input or output as required. The high

current driver, U12, must also be installed. Each card reader is connected to digital port J3 as follows:

Card Number J3 pins

Hold D1 D0 LED

0 8 21 19 10

1 6 25 23 4

2 3 22 24 1

3 7 18 20 5

The green LED on the reader may be controlled using the LINE# command. A '0' forces the LED to green

and a '1' forces it to red. A yellow LED indicates a card has been swiped and the reader is ready to send the

information.

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Remote-processing BASIC 52 Uživatelský manuál Strana 28