Remote-processing BASIC 52 Uživatelský manuál stáhnout pdf (Strana 143)

RPBASIC-52 PROGRAMMING GUIDE

2-124

CONFIG LINE

Syntax: CONFIG LINE 0,configu ration 0,p ort C

CONFIG LINE 100,configu ration 1,p ort A,port B,port C

Where: configuration n = port configuration per tables below.

port A = Digital I/O port A output data

port B = Digital I/O port B output data

port C = Digital I/O port C output data

Function: Configures digital I/O ports for inputs and outputs.

Mode: Command, Run

Use: CONFIG LINE 0,1,128

CONFIG LINE 100,3,255,0,240

Cards: All. Check line ranges for your card.

DESCRIPTION

Upon pow er up or reset, digital I/O port J3 (lines 100-123) are configured for inputs. Lines at P6 are

configured for inputs (L0-L3) and outputs (L4-7). Outputs L4 and L5 are low and L6 and L7 are high. The

status of these lines is changed using this command.

There are two digital I/O line number groups on the RPC-320. One group, 0-8, access lines at the terminal

strip on the card. Line number 0 is used to s pecify these lines. port C simply specifies which lines are high

and low.

The second digital group is specified as line 100 and determines the configuration for digital I/O port J3. An

82C55 is used to interface the 24 digital I/O lines. The 82C55 consists of 3 ports organized as follows:

Port A Eight lines that can be programmed as all inputs or all outputs.

Port B Eight lines that can be programm ed as all inputs or all outputs.

Port C Eight lines which can be programmed in one group of eight lines or two groups of four lines

as all inputs or a ll outputs.

The following table is used for the configuration 0 or 1 parameter. It determines which port, or part of a port,

is an input and output.

configuration 0 Lines 4-7 Lines 0-3 (Upper and lower Port C)

0 Output Output

1 Output Input

2 Input Output

3 Input Input

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 162 163

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Remote-processing BASIC 52 Uživatelský manuál Strana 143