User`s guide

Contents
DC 900-1340I 9
A BSC 3270 Line Control Procedures 193
A.1 Control Station Procedures..........................193
A.1.1 General Poll................................193
A.1.2 Device Selection.............................194
A.1.3 Specific Poll................................195
A.2 Tributary Station Procedures.........................195
A.2.1 Normal Mode...............................196
A.2.2 Test Mode.................................196
A.3 Line Up/Down Reporting...........................196
A.4 Virtual Device Procedures ..........................197
A.4.1 Virtual Printer Operation........................197
A.4.2 Virtual Display Operation........................197
A.4.3 3270 Command Checking........................200
A.4.4 BSC 3270 Sense/Status Message .....................204
A.5 Station Up/Down Reporting.........................206
A.6 DSR/DCD Up/Down Reporting.......................206
A.7 Freeway/Line Interface............................207
A.8 Modem Control Lines.............................207
A.9 Clock Signals..................................208
A.10Idle Line Condition..............................208
B BSC 2780/3780 Control Procedures 209
B.1 BSC 2780/3780 Communications Control . .................209
B.1.1 BSC 2780/3780 Software Initialization .................210
B.1.2 Normal Link Start............................211
B.1.3 Signon Procedure using BSC 2780/3780 Software Commands ....212
B.1.4 Data Reception..............................216
B.1.5 Normal Data Transmission .......................217
B.1.6 Priority Data Reception.........................218
B.1.7 Recoverable Errors In Transmission...................220
B.1.8 Unrecoverable Errors In Transmission .................221
B.1.9 Normal Link Stop ............................223
B.2 DSR/DCD Up/Down Reporting.......................224
B.3 Freeway/Line Interface ............................224
B.4 Modem Control Lines.............................224
B.5 Clock Signals..................................224