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Section 2 Getting Started

2.8

either input or output. At power on, all 40 bits are in the input mode. Each 8 bit

group is one port, beginning with

Port 1

as the least significant 8 bits, and

Port 5

the most significant 8 bits.

2.3.1 Logic Levels

The data and handshake output lines will drive two TTL loads. In addition,

ports 3, 4, and 5 outputs are 5 Volt CMOS compatible. All input lines are less than

1.5 TTL loads. All inputs are protected against damage due to high static voltages.

Normal precautions should be taken to limit the input voltages to -0.3 to +7.0 volts.

All I/O lines are referenced to

COMMON

(Pin 50).

2.3.2 Digital I/O Port Pinout (rear view)

The following diagram illustrates the digital I/O edge connector as view from

the rear of the

Digital232

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Measurement-computing Digital232 Manuale Utente Pagina 16