Installation and Commissioning

Troubleshooting Tools3.4.5 Disk driveThe signal interface with the disk drive; TTL levels “0” 0V, “1” +5V.X9Pin A Explanation9 RD N Read Data, pulses. Data pulses when reading the diskette10 WP N Write Protect, static active low. Indicates whether ornot the diskette is write protected.11 DSKCHG N Disk Change, static active low. Indicates whether ornot there is a diskette in the unit.12 WD N Write Data, pulses. Data pulses when writing to thediskette.13 SSO N Side Select, static active low. Indicates which side ofthe diskette is active.14 DIRC N Direction in, static active low. Indicates that theheads are to move inwards.15 0VX9Pin C Explanation9 IP N Index, pulses. One pulse per cycle, c. every 200 milliseconds.10 TR00 N Track 00, active low. Indicates that the heads arelocated at track 0 of the diskette.11 MO N Motor on, static low. Starts the motor in the selectedunit.12 WG N Write Gate, pulses. Enables writing.13 STEP N Step, pulses. Steps the heads in the direction indicatedby DIRC N.14 HD N High Density, static active low. Indicates that a 1.44MB diskette is in the unit.15 0VProduct Manual 37