PSI BOX Reference
Modes 1-6 & 8.
Mode 6.
_______
Function: An RS232 input to IEEE output interface.
Use:
PSI connects an IEEE output device to the RS232
port of a computer.
Example: HP IEEE Thinkjet printer from RS232 port of a
PC running LOTUS 123, AutoCAD etc.
Commodore IEEE printer from PC serial port.
Summary.
_________
The PSI BOX acts as a one way data converter reading
RS232 information from a computer’s serial port and passing it
straight through to an IEEE bus output device.
Data is received according to the RS232 input handshake
and output according to the IEEE output handshake. In this
mode no other sort of data transmission is possible.
Use Mode 8 for IEEE plotter control from a computer’s
RS232 serial port.
Talk Only Operation.
___________________
The PSI BOX can also be set to act as a Talk Only
IEEE from RS232 input interface. To select the Listen Only
configuration set the Mode switches to Mode 6 and set the IEEE
address dip switches all upward ie address 15. Instead of the PSI
BOX becoming IEEE device 15 it will be in Talk Only mode.
Here the a controller instructs one or more devices to listen, the
PSI BOX will take data from its RS232 input buffer and send it
to all the listeners on the bus. The controller should not instruct
any device other than the PSI BOX to Talk.
In addition, the PSI BOX will happily Talk to a Listen
Only device, in a system without a controller, that does not
provide any addressing information.
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Chapter 6
