Commands - IBM 5251 Series Maintenance Information Manual

Commands
Note: The binary number in parentheses next to the
command is combined in bits 10 through 14 of the
command frame.
Clear
(10010):
clears the addressed feature or display
station from the present value of the address counter to
the present value of the reference counter.
EOQ (00010): indicates the end of the command
queue. Bits 8 and 9 of the command frame must be on
(1). Only polls will be recognized until a not busy status
is returned to the controller in response to a poll.
Insert Character
(00011):
is followed by one data
frame containing a character to be inserted at the
address counter location.
Load Address Counter (10101): is followed by two
data words and causes bits 7 through 14 of the data
words to be written in the address counter.
Load Cursor Register (10111): is followed by two data
words and causes bits 7 through 14 of the data words
to be written in the cursor register.
Load Reference Counter
(00111):
is followed by two
data words and causes bits 7 through 14 of the data
words to be written in the reference counter.
Move Data
(00110):
moves data, to the reference
counter address, between limits set by the value of the
address counter and the value of the cursor register.
Poll (10000): is sent from the controller to the display
station and starts the transmission of one or two status
words per poll. The poll command responds to and
resets a line parity error from the display station. It also
responds to the last status transmission from the
display station.
Read Activate (00000): this command is sent after the
setup specified by a read command is completed and
starts
th~
transmission of requested data.
4-12
Write Activate (00001): this command immediately
precedes the data transmitted bV the controller after the
work station has been set up by a write command and
causes the work station to start receiving the data from
the controller.
Read Base
10
1
(0000 1100):
request the
retransmission of one ID word to the Model 2 or 12.
This command can be .used by the Models 2 and 12 to
determine the characteristics of attached work stations.
Read Between Limits1
(11010):
causes data to be
returned from an area in read/write storage; this area is
inside the limits of the address counter register and the
reference counter register.
Read Data 1
(01000):
starts the transmission of one
byte of data from the display station to the controller.
Read Field Immediate
1 (11001): is followed by 2 data
bytes that contain the starting address of the read.
Data is transferred from that address until the next
screen attribute is reached.
Read Keyboard
10
1
(101100): determines the type of
keyboard and country.
Read Light Pen Data
(10101000):
request the transfer
of 16 frames of light pen data.
Read MSR1 (10011000): request the transfer of the
next 16 frames of magnetic stripe reader data.
Read Registers 1
(11100): starts the transmission of six
data words containing the contents of the three control
registers.
Read to End of Line 1
(01010): requests a response
from the display station; this response consists of one
display line of data from the read/write storage.
1
Commands that must be followed by either a read activate or
a write activate command.