Sony SMO-F551 Technical Manual page 20

Device Type
Enable Fast SCSI
Enable Termination
Terminator Power
Terminator Power Source
*Caution:
When the Fast SCSI function is used, it is recommended that the host system and SCSI cables
should conform to the Fast SCSI. The cable requirement which is stated in the ANSI SCSI-2
document is as follows:
MHz
It is also recommended that the cumulative cable length should be minimized and the SCSI bus
termination should be well maintained.
20
SMO-F551 Technical Guide and Specifications
Sony Corporation 1998
This switch is for changing the INQUIRY command response of
the drive (Peripheral Device Type field). When the pair of pins
A10/B10 is left open, the drive responds as an Optical Memory
Device (type 7) (Factory Default). Shorting this pair of pins
forces the drive to respond as a Direct Access Device (type 0).
Shorting the pair of pins A9/B9 enables Fast SCSI mode.
(See *Caution.)
This functional switch informs the drive whether to adapt the
internal SCSI active terminator.
A11/B11 enables the SCSI Termination. Leaving them open
disables the termination.
This line is connected to the SCSI bus TERMPWR line.
This line supplies +5V DC through an isolation diode for SCSI
terminator
Connecting pair of pins A12/B12 enables the SCSI TERMPWR
signal.
Minimum conductor size:
Characteristic impedance:
Signal attenuation:
Pair-to-pair propagation delay delta:
DC resistance:
power to the SCSI
28AWG
90Ħ to 132Ħ
0.095 dB maximum per
0.20 ns maximum per meter
0.230ƒ¶ maximum per meter at 20 °C
Shorting the pair of pins
bus TERMPWR
meter at 5
line.