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

The analog-to-digital converter furnishes an overload indication in the data word whenthe signal level falls outside of a range that can be converted.A temperature reference attachment is available for use in the cold junction compensationof thermocouple inputs.I/O CommandsThe prepare I/0 and halt I/O commands are used as described in Chapter 4 under"Input/Output Instruction" and in this chapter under "Module Device Addresses."Immediate read and immediate write commands transfer data between the analog inputcontrol and the processor module. The setting of the modifier field bits in the commandfurther defines the operation to be performed.In all I/0 commands addressed to analog input, the device address field contents must be100100. The module address varies depending upon the physical location of the multifunctionmodule in the 5026 Enclosure.Usually, a complete operation is performed within the time limit required for executionof the immediate commands. Exceptions to this rule are two convert commands that startthe conversion cycle and then permit the program to resume normal operation while awaitingthe interruption request presented by the module at the end of the conversion cycle.Executing either of the two 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 to thisdevice address (except read ISW) 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 01000000000100100 XX XXXX1 11 II 11 11 i 1 III 11111 11111■••••■•■■■■•••••■■,,••■••■■••,....../......,.,■,0 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, to the analog inputmodule. The control information word has the format:0 15Not usedMpxr addrR R R 00 0 XX X XX1 1 1 1 1 I 1........„,•■•■••••••••■•••,■•0 0-7 0-1 XIBM 5012 Multifunction Module Model Al 13-5