PSI BOX Reference
Mode 7 Overview
Figure 7-5 Mode 7 IEEE Command Functions.
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ABORT
Resets the bus ,pulse IFC, assert REN, assert ATN.
CLEAR
Resets ALL devices. Performs DCL, device clear.
CLEAR 6,7
Resets devices 6 and 7. Performs SDC.
CONFIGURE
Configures device’s response to PPOLL.
DISABLE
Prevents some or all devices responding to PPOLL.
ECHO=
Instructs PSI BOX to echo RS232 data back to host.
END=
Sets the End of Sequence method for OUTPUTs from PSI.
ENTER
Ask for data from IEEE device.
EOS=
Specifies EOS string for IEEE data INPUTs to PSI BOX.
LOCAL
Enable front panel control. REN and ATN sent false.
LOCKOUT
Disable front panel controls. Performs LLO command.
MACRO
Defines or lists a user’s own macro command.
MESSAGES=
Enable or disable PSI BOX to host error messages.
NO TO
Disables time out.
OUTPUT
Sends data to current bus device.
PPOLL
Performs a complete Parallel Poll
READ
Reads one byte of data from addressed talker.
REMOTE
Asserts REN line continuously true, sets ATN false.
SHOW
Display & Explain Control Status String.
SPOLL
Serial Polls the current device.
SPOLL 6,7
Serial Polls devices 6 and 7.
STATUS
Sends the current PSI BOX parameter table to RS232.
TIMER
Wait for a given number of milli seconds
TO
Sets an i/o timeout value.
TRIGGER
Performs Group Execute Trigger.
UNCONFIGURE Prevents devices responding to Parallel Poll.
VERSION
Returns the ROM version number and date.
WAIT
Wait for a given number of milli seconds
WAIT SRQ
Waits till SRQ is asserted by device.
X
Execute stored macro a specified number of times.
@
Emergency RESET.
RESET
Specify the RESET character.
Mode 7 Memory Allocation.
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The built in 32K buffer of the PSI BOX can be bypassed
by setting the BUFFER ON front panel DIP switch low when
the PSI BOX is powered on or reset.
Regardless of whether the buffer is enabled the PSI BOX
allocates approximately 256 bytes of ram to hold the Mode 7
IEEE control status parameter table. In addition, another 256
bytes are always set aside for the RS232 input buffer, this
allows the PSI BOX to a compile a complete BUS command in
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Chapter 7
