Accepted Commands - IBM 3278 Technical Reference

Accepted Commands
Below is a list of the commands sent from the control unit and
recognized by the IBM Personal Computer 3278/79 Emulation
Adapter Card.
Note: The emulation adapter will respond to all good
transmissions.
Coaxial
Frame Bits
Commands
56789
READ Poll (include priority)
o
0 0 0 1
Read Data
o
0 0 1 1
Read Address Counter High
00101
Spare
o
0 1 1 1
Read Terminal I D
o
1 0 0 1
Read Multiple
o
1 0 1 1
Read Status
o
1 1 0 1
Spare
o
1 1 1 1
Poll Acknowledge 1 000 1
Spare
1 0 0 1 1
Read Address Counter Low 1
o
1 0 1
Spare
1
o
1 1 1
(Part 1 of 2) Accepted Commands
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