User`s manual

THE IBM 5250 ENVIRONMENT
AXIS AX-3 Cobra+ Technical Reference 10
The Twinax Protocol
All communication between a twinax controller and a twinax printer is initiated by the
controller. On request from the controller, a printer responds with the appropriate
information.
Printer Poll
Command
This command will initiate the transfer of two status words (frame 1 and frame 2) to
the controller.
Printer response frame 1 and 2 (bit 0 MSB) to a printer poll command (transmission
information excluded):
Read Device ID
Command
This command will make the addressed device respond with one word of information
(frame 1).
Printer response frame 1 (bit 0 MSB) to a Read Device ID command (transmission
information excluded):
Frame Bit Information
Frame 1 Bit 4-6 Device Address
Bit 7 Busy
Bit 8 Line parity
Bit 9 Unit not available
Bit 10 Outstanding status
Bit 11-13 Exception status
Frame 2 Bit 7 Invalid SCS control code
Bit 8 Invalid SCS parameter
Bit 9 Receive buffers full
Bit 10 Print complete
Bit 11 Cancel request
Bit 12 Print mechanism not ready (5256 only)
Bit 13 End of forms
Bit 14 Graphic check (unprintable character)
Frame Bit Information
Frame 1 Bit 7, 8 Printer model (1, 2, 3, 4)
Bit 9, 10 Device type (display, printer)
Bit 11-14 Printer type ( e.g. 5256, 5624, 5225, 4214, 3812/5219)