IBM 5251 Series Maintenance Information Manual page 173

Reset (00010): sets the attributes to normal and
moves the cursor to the upper left corner. A specific
address feature can reset selected portions of the
display station, or the controller can send the display
station address for a complete station reset.
Reset Light Pen (10100010): resets the light pen
hardware.
Reset MSR (10010010): resets the magnetic stripe
reader hardware.
Search Next Attribute (00100): causes the display
station to search read / write storage for the next
attribute.
Search Next Null (10100): causes the display station to
search read / write storage for the next null.
Set Mode (10011): causes the display station to
receive one word that is specified as a mode control.
This command must be sent before the 5251 makes any
multiframe response.
Write Control Data' (00101): followed by 1 data byte,
which controls the display screen to conditionally reset
the exception status, control the keyboard clicker during
input inhibit, control the audible alarm, input cursor
display, blink the cursor, and reverse image.
Write Data and Load Cursor' (10001): followed by 1 to
14 data frames. Data is written to the location address
counter, the address counter is incremented, and the
cursor register is updated to the new value in the
address counter.
Write Data and Load Cursor to the Indicators and
Switches' (1010001): followed by 1 data byte, which
contains the control information for the display screen
indicators.
, Commands that must be followed by either a read activate
or a write activate command.
Write Immediate Data' (l1101): causes the display
station to store all the data the controller sends. If there
is more data than the storage area can contain, a
storage overrun error occurs.
Theory 5251 MIM 4-13