User's Manual

April ’00 Chapter 2. Hardware

2.2.1.2 B - General Purpose Inputs/Outputs

The Reader has eight general purpose TTL-Level Inputs/Outputs. By means of the

configuration set-up, they can be set in groups of four to be Input or Output. Further-

more, there is a reset connection and a 5 V regulated output.

The pin assignment is given in Table 5 and their specifications are given in Table 6.

Table 4: Supply Connector - Specifications

Parameter Minimum Maximum

Logic Supply Voltage VSL 10 V 24 V

Logic Supply current ISL - 2.5 A

Table 5: General Purpose Inputs/Outputs

Pin Signal Description Direction

1 GP IO 7 General Purpose I/O 7 Input/Output

2 GP IO 6 General Purpose I/O 6 Input/Output

3 GP IO 5 General Purpose I/O 5 Input/Output

4 GP IO 4 General Purpose I/O 4 Input/Output

5 GP IO 3 General Purpose I/O 3 Input/Output

6 GP IO 2 General Purpose I/O 2 Input/Output

7 GP IO 1 General Purpose I/O 1 Input/Output

8 GP IO 0 General Purpose I/O 0 Input/Output

9 - not connected -

10 IN1 Input 1 Input

11 IN0 Input 0 Input

12 RESET- Reset Input

13 VCC

Regulated 5 Volt dc Supply

(see note)

Output

14 GND Signal Ground -

15 GND Signal Ground -

CAUTION:

Do not connect any power supply to pin 13 as it would

damage the reader.

The total consumption of the two VCC outputs (General

Purpose Inputs/Outputs pin 13 together with Open Collec-

tor & I/Os - pin 1) must not exceed 500 mA.