A: BSC 3270 Line Control Procedures
DC 900-1340I 201
Figure A–6: BSC 3270 Command Checking
Client Freeway
Communication Line
illegal 3270 command
<EOT>
3270 command without
select
specific poll
status message (CR)
<ACK1>
select
<EOT>
<ACK0>
specific poll
status message (OC)
<ACK1>
<EOT>
<ACK0>
<EOT>
leading <ESC> char
