Mode 7 Overview
PSI BOX Reference
its memory, as it waits for the trailing <CR> before the
command is interpreted.
When the buffer is enabled then one half of the PSI BOX
ram, 16K, acts as the RS232 input buffer, the other half as the
RS232 output buffer.
If the RS232 input buffer of the PSI BOX becomes full
then it will be unable to receive more RS232 data until the IEEE
device accepts data from the PSI BOX.
If the RS232 output buffer of the PSI BOX becomes full
then the PSI BOX will be unable to receive any more IEEE data
until the RS232 device accepts data from the PSI BOX.
The transfer of data between the PSI BOX and the
computer’s RS232 port is governed by either the XON/XOFF
handshake or by the DTR/DSR etc lines, as selected by the user
via the XON XOFF front panel DIP switch.
Chapter 7
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