IBM System/7 Functional Characteristics - All about the IBM 1130 ...

Page of GA34-0003-6, -7As Updated August 20,1976By TNL GN34-0340Area Station Local I/O Guidance Character3 4 71 1 1 Data entry unit codeStatus character codesAssociated with endAssociated with endStatus Associated with command results in Status Associated with command results incharacter end request from the following action character end request from the following action(hex) area station means: at the area station: (hex) area station means: at the area station:0020406080AOCOE0All otherLocal I/O of area stationData entry unitGood endSelect transaction 00 Good end Release workindicatorstationDiagnostic mode No action 20 Diagnostic mode No actionRelease in data mode Light repeat/clear 40 Overrun Error indicationRelease in diagnostic 60 Overrun in diagnosticand data mode Light repeat/clear mode No actionInvalid character Light repeat/clear 80 EOB time-out Error indicationInvalid character and AO EOB time-out anddiagnostic mode Light repeat/clear diagnostic mode No actionOverrun—card reader Light repeat/clear Output adapterOverrun in diagnosticmode Light repeat/clear 00 Good end No actionAccepted as guidance 20 Diagnostic mode No actioncharacters by local 80 Out of paper No actionI/O device AO Out of paper anddiagnostic mode No actionaCritical Timing ConditionsInput/output adapters contained in 2791/2793 Area Stations are designed to operate at adata rate of 212 frames per second, spaced at equal intervals of 4.7 milliseconds. However,the time required for mechanical operations to take place within a 2790 system device mayreduce the data rate from the maximum of 212 frames per second.Figure 13-6 shows the 2790 devices that have critical timing 'Conditions. Most of thesecritical timings apply only to a specific sequence of commands when they are addressedto the particular device. For example, a read data command frame addressed to a 1035Badge Reader must be followed by two frames that are not addressed to the same 1035Badge Reader before a read null command frame can be addressed to this badge reader.(A read null command frame can, however, be addressed to another device or another1035 Badge Reader.)Critical timing situations can be avoided by observing the designed data rates. Theserates can be achieved by using every 45th frame to communicate with a 1053 Adapter,and every 9th frame to communicate any command sequence to other input/outputadapters.IBM 5012 Multifunction Module Model Al 13-37