12-7
IM 701450-01E
12
Saving and Loading Data
12.3 Connecting MO Disk Drives or Hard Disks to
the SCSI
SCSI Specifications
Item Specifications
Interface standard SCSI (Small Computer System Interface), ANSI X3.131-1986
Connector type Half pitch 50 pins (pin type)
Connector pin assignment Unbalanced (single-ended), see table below.
125
2650
2
27
3
28
24
49
23
48
Pin No.
Pin No. Signal Name Pin No. Signal Name
1 to 12 GND 38 TERMPWR
13 NC 39, 40 GND
14 to 25 GND 41 -ATN
26 -DB0 42 GND
27 -DB1 43 -BSY
28 -DB2 44 -ACK
29 -DB3 45 -RST
30 -DB4 46 -MSG
31 -DB5 47 -SEL
32 -DB6 48 -C/D
33 -DB7 49 -REQ
34 -DBP 50 -I/O
35 to 37 GND
Items Necessary for Connection
Cable
Use a commercially sold cable that is three meters or less in length, has a ferrite core on
each end of the cable, and has a characteristic impedance between 90 and 132 Ω.
Connection Procedure
1. Connect the SCSI cable to the SCSI connector on the rear panel of the DL7400.
2. Turn ON the SCSI device and the DL7400 (in that order). To format a disk,
follow the procedures given in section 12.6.
SCSI Devices That Can Be Connected
Most SCSI devices (MO disk drive or hard disk) can be connected to the instrument, but
there are some exceptions. For details on which devices can be connected, contact your
nearest YOKOGAWA dealer as listed on the back cover of this manual. For general
handling precautions for the connected SCSI device, see the instruction manual that is
provided with the device.
Note
• When connecting multiple SCSI devices in a chain, attach a SCSI terminator to the device
at the other end of the chain.
• Hard disks that are formatted with the DL7400 cannot be read using the NEC PC-9800
Series computers.
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