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

Executing any of the three commands sets on the ISW device-busy bit, which remains onduring the conversion time. When the conversion is complete, an interruption request ispresented to the processor, the device-busy bit is turned off and the device-end bit isturned on. Condition code 2 is returned to all immediate commands issued (except readISW or read DSW) while the module is busy or has a pending interruption.The normal analog input programming routine is shown in Figure F-1 of "Appendix F."Convert Analog Input0 5 8 11 16 20 26 31Op code R Fun Zeros Mod DA MA0 0 0 0 1 XXX 0 0 1 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 XX XXXX1 1 1 1 ii II 1 1 1 1 III 1 1 1 1 1 1 1 1 1 10 8-F 2 0 0 9 0-3 XThis command starts an analog-to-digital conversion cycle based upon control informationcontained in the index register (R), or the accumulator if R=000. The control informationword has the format:0 15Not usedMpxr addrR R R 0 X XXX X XXI I 1 1 1 1 1 1 1 1 1 I I\ws•Ne■•r''..ao.s,••■■■■•■,,awr's■•••■,,■.,0 0-7 0-7 XThe range bits (RRR) in the control word specify the input voltage range and the amplifiergain desired, as shown in the following table.RRR Bits Input Voltage Range Amplifier Gain000 Automatic gain001 +10 mV 512010 +20 mV 256011 +40 mV 128100 +80 mV 64101 +160 mV 32110 +640 mV 8111 +5.12V 1When automatic gain is specified (RRR bits =000), the optimum gain (one of the sevenamplifier gains) is selected automatically, based upon the input signal voltage. Theselected gain can be returned to the program, along with the converted signal data, byissuing a read-ADC command. Since the indication of gain requires three bits, the inputdata itself is reduced to 12 bits plus sign.The range bits (RRR) have no significance if the high-level amplifier is installed.This convert-analog-input command starts an analog-to-digital conversion cycle of theanalog input point specified by the multiplexer address field in the control word. Aninterruption request occurs at the end of the conversion cycle. The results of the conversionare then obtained by issuing a read-ADC, a read-ADC-extended-precision, or aread-and-convert-ADC command.With either the read-ADC command or the read-and-convert-ADC command, the dataformat is in short form (12 bits plus sign) if automatic gain was specified, or in standardform (14 bits plus sign) if a particular range was specified. The read-ADC-extended-precisioncommand always returns the data in standard form.IBM 5014 Analog Input Module Model Cl 11-3