DEIF PSM-1 Communication module

SCSIbus Terminator Power The power for the terminator of any SCSI device will be provided from the CPU-30SEN-R board directly, or from the SCSIbus itself. If termination power is not delivered from any other SCSI device, it is delivered from the CPU board. The TERMPWR (terminator power) supply from the CPU board is protected by a self resetting fuse (1A max) and a diode in series, as defined in the SCSI specification. The on-board terminators will draw power from the SCSIbus TERMPWR.

RESET Function Switch 

A reset of all on-board I/O devices and the CPU is performed when the RESET switch is pushed to the "UP" position. Additionally, the APNbus signal BRST is driven by the CPU-30SEN-R to execute a bus-reset on the APNbus. RESET is held active until the switch is in "DOWN" position. In addition, a local timer guarantees a minimum reset time of 200-300ms. Power fail and power up also force a reset (200-300ms) to start the board if the supply voltage is out of range (below approximately 4.85 Volts). For more information, please refer to section 5.15 “Reset Generation” on page 124. In combination with the ABORT switch, the RESET switch has a special function which is described in the Boot Software description of the FGA-002 User’s Manual. The Reset Function can be controlled by switch SW7-1.

ABORT Function Switch 

An interrupt on a software programmable level is provided on the board to allow an abort of the current program, to trigger a self-test or to start a maintenance program. The ABORT switch is activated in "UP" position and deactivated in "DOWN" position. In combination with the RESET switch, the ABORT switch has a special function which is described in the Boot Software description of the FGA-002 User’s Manual. The Abort Function can be controlled by switch SW7-2.

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