Sending Data Using The Bus Command; Receiving Data Using The Bus Command - Brainboxes PS-307 User Manual

Mode 7 Overview

Sending Data Using The Bus Command.

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Data can be sent to the IEEE bus devices in several ways.
As mentioned previously data sent in pass through to the current
device. Additionally data can be sent to the IEEE bus devices
using the BUS command.
The data may be sent in one of three ways:- as specified
by decimal numbers after a DATA or EOI command, as literal
data within delimiters after a STRING command, as literal data
within delimiters after an OUTPUT command.
BUS LISTEN 5 DATA 72,69,76,76,79 UNL <CR>
BUS LISTEN 5 STRING "HELLO" UNL <CR>
BUS OUTPUT "HELLO" <CR>
Whilst these methods the main differences lie in the fact
that the addressing of the devices has to be explicitly given
when using the DATA and STRING commands but that the
OUTPUT command addresses the current device by default.

Receiving Data Using The Bus Command.

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Data can be requested from any IEEE bus device using
either the READ or ENTER command.
BUS TALK 5 READ UNT <CR>
Like the DATA command the READ commands requires
the user to give explicit addresses and unaddresses when
receiving data. The READ command reads one data byte from
the addressed talker, the byte is stored in the IEEE control status
string, position 66-68.
BUS ENTER <CR>
BUS ENTER 200 <CR>
The ENTER command is much more flexible, a complete
bus handshake sequence is performed with the current device
Chapter 7
PSI BOX Reference
Page 75