Measurement-computing Digital488/80A Instrukcja Użytkownika Pobierz pdf (Strona 55)

C - Configuration

SYNTAX

Cn Define I/O mode n of ports, where n = value from 0 to 5.

(Default) Define all 5 ports as input.

Define Port 1 as output; the other ports are input.

Define Ports 1 and 2 as output; the other ports are input.

Define Ports 1 through 3 as output; the other ports are input.

Define Ports 1 through 4 as output; Port 5 is input.

Define all 5 ports as output.

C? Returns current port configuration mode n.

DESCRIPTION

Ports 1 through 5 are configured as inputs or outputs with the Configuration (

C) command. Each port is 8-bits wide. At

power-up, all ports are initialized as inputs; the Configuration command is usually the first command to be sent after

power-up. All ports programmed as outputs are set to a logic 0 after receiving the Configuration command. The actual

output level is dependent upon the Invert command (

I16).

Configuration Command Port 5 Port 4 Port 3 Port 2 Port 1

Input Input Input Input Input

Input Input Input Input Output

Input Input Input Output Output

Input Input Output Output Output

Input Output Output Output Output

Output Output Output Output Output

CAUTION

Because the Configuration (C) command is used, the following programming

example(s) will not work properly if the HVCX1 option is installed with a conflicting

hardware configuration. To be safe, remove the HVCX1 board and replace it with the

jumper board to run the example(s).

EXAMPLE

PRINT#1,"CLEAR08"

Line 1: Reset the Digital488/80A.

PRINT#1,"OUTPUT08;C1X"

Line 2: Configure Port 1 as output; Ports 2 through 5 as inputs.

PRINT#1,"OUTPUT08;C?"

Line 3: Query current port configuration.

PRINT#1,"ENTER08",

INPUT#2,A$,

PRINT A$

Line 6: Display shows: C1

Digital488/80A User’s Manual

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Measurement-computing Digital488/80A Instrukcja Użytkownika Strona 55