Serial Channel Status Word; Serial Channel Baud Rate Selection - Control Data Corporation INFORMATION SYSTEMS TERMINAL II Hardware Maintenance Manual

TABLE 4-4. SERIAL CHANNEL BAUD RATE SELECTION
DATA DATA DATA BAUD
LINE 7 LINE 6
LINE 5 RATE
0 0
0 150
0 0
1 300
0
1 0
600
0 1
1
1200
1
0 0 2400
1 0 1
4800
1
1
0
9600
1
1 1
19200
Read Serial Data (Input 05) - This function transfers data
from the serial receiver to the processor. The data is
valid only when the serial character ready status is set.
If the receiver is set to receive words with less than 8
bits, the data is right-justified within the 8-bit transfer.
Read Serial Status (Input 06) - This function transfers
status information from the serial interface to the proces-
sor. The status word is as shown in figure 4-12.
1
=
INTERRUPT PENDING
1
==
CHARACTER REQUEST
1
=
CHARACTER READY
1
=
RECEIVE ERROR
0
=
SERIAL CHANNEL CARRIER
DETECTED
1
=
CLEAR TO SEND
1
=
DATA SET READY
0
=
PLATO CHANNEL CARRIER
DETECTED
Figure 4-12. Serial Channel Status Word
The following paragraphs explain the meaning and use of
these Status bits:
• Status Bit 0, Interrupt Pending - This bit is sent
when an interrupt has been generated by either cha~­
acter request or qharacter ready and remains set
until the processor services it.
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