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

Read DSW0 5 11 16 20 26 31Op code R Fun Zeros Mod DA MA0 0 0 0 1 XXX 0 1 0 0 0 0 0 0 0 1 1 1 XXXXXX11 1 1 II II MI III t I I I I 11111••■■••■.„,...../.■•■■•■,....1.,•■■••..,0■es•■••••■,■•••■•■■•■,.,■■•,•■•••••,,•■■•• ••■■••,,...1■0 ••■••■,/ma., •0 8-F 4 0 7 0 0-3 XThe read DSW command stores the 16-bit device status word (DSW) associated with thedigital I/O module into the index register (R), or the accumulator if R=000. Execution ofthis command resets the bits in the DSW.Device Status Word (DSW): The 16 bits in the device status word are set as a result ofdetected error conditions occurring during the execution of an immediate command to theI/O module. The operating program is notified of these error conditions by returning conditioncode 1 to the processor. If other commands are attempted before resetting the DSWbits, condition code 1 continues to be returned to the program.The significant bits in the DSW and their meanings are:Significant Bits Meaning1 Command reject. The digital I/O module cannot execute thecommand. (For example, an interruption-causing command issuedto the device when it is disabled for interruptions.)3 Open circuit. A digital input circuit breaker is open when the digitalinput subaddress was selected.14 Data check. The digital I/O module has detected a parity errorinvolving data. The operation that caused this condition usually canbe retried successfully if the error condition is intermittent.15 Invalid device address. An immediate command was issued to a devicethat is not installed in the digital I/O module.MODULE DEVICE ADDRESSESI/O commands to the digital I/O module use the six-bit device address field (bits 20to 25 of the PIO instruction) to specify the particular function being addressed. The deviceaddress bit assignments for each function are:Device Address Function000000 Digital input group 0 with or without process interrupt feature000100 Digital input group 1 with or without process interrupt feature001000 Digital input group 2001100 Digital input group 3010000 Digital input group 4010100 Digital input group 5011000 Digital input group 6011100 Digital input group 7100000 2790 Control110000 Digital output group 0110100 Digital output group 1111000 Digital output group 2111100 Digital output group 3XXXXYY The last two bits (YY) are the quadrant. When YY is not 00, theaddress is assigned to a custom attachment.IBM 5013 Digital I/O Module Model Al 14-3