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Mode 7 Overview
byte counts, SERIAL POLL and PARALLEL POLL status bytes,
EOS and END bytes etc.
The IEEE control status string is very important, its format
is identical to the PC IEEE control status string. Changing the
parameters in the IEEE status string controls the operation of the
PSI BOX, the source and destination of IEEE data exchanges
and many other vital criteria.
The precise format of the data in the IEEE control status
string is given on the PSI BOX Mode 7 Quick Reference Card
and is given later on in this chapter.
On power up in mode 7 the PSI BOX sends a string of
data to the RS232 computer. This message consists of the
current PSI BOX rom version and the default IEEE control
status string.
PSI BOX Version 4.0f 16/03/90
STATUS 04, ,0,1,1,0,00,00000,00000,000,000,000,0,0,1 etc
The 'my listen' and the 'my talk' address of the PSI BOX
are by default zero.
The address of the IEEE current device that the PSI BOX
is to access is that set on the IEEE address DIP switches, and is
the first field in the status string. The current device can be
changed at any time from the RS232 computer using a BUS
command. The default secondary address is NONE, this is stored
as the second field in the status string.
The Default Mode 7 Configuration.
______________________________ _
The default PSI BOX Mode 7 configuration as it powers
up without any changes being made via the BUS command. Is
given below.
Chapter 7
PSI BOX Reference
Page 71
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