AM3270/TR3271 Reference Manual

Contents
viii 086705 Tandem Computers Incorporated
Section 6 TR3271 Subdevice Protocols
What Are They? 6-1
Details of the CRT Protocol 6-1
Message Format—Outbound Data 6-1
Message Format—Inbound Data 6-2
Applicable File-System Procedures 6-2
Error Handling 6-8
Details of the PTP Protocol 6-8
Sample Configuration 6-9
What About File System Requests? 6-10
Communication Loss 6-10
Typical Pass-Through Configuration 6-11
Appendix A AM3270 and TR3271 Controller and Device Tables
Controller/Device Addresses A-1
Address Examples A-2
Glossary Glossary–1
Index Index–1
Figures Figure 1-1. Two Methods of Character Framing 1-2
Figure 1-2. Basic Message Block 1-4
Figure 1-3. Multiblock Message 1-4
Figure 1-4. Poll and Select Message Sequences 1-13
Figure 3-1 Typical AM3270 Configuration 3-1
Figure 3-2. Example of AM3270 Pass-Through Configuration 3-2
Figure 3-3. Poll Operation 3-4
Figure 3-4 Select Operation 3-5
Figure 3-5. READ Operation 3-8
Figure 3-6. WRITE Operation 3-9
Figure 4-1. ITI Protocol Message Formats 4-1
Figure 4-2. Pass-Through Protocol Example 4-8
Figure 4-3. CRT Protocol Message Format—Outbound Data 4-10
Figure 4-4. CRT Protocol Message Format—Inbound Data 4-11