Seagate ST423451N/W/WD manual Terminating the drive ST423451W shown

Elite 23 Installation Guide, Rev. A 39

W/WD drives

Terminating the drive

ST423451W drives are terminated with permanently mounted IC active terminators. If you install one of these drives and it is not on the end of the SCSI bus, disable the terminators by removing the TE jumper from pins 19 and 20 of connector J4A. If you install the drive on the end of the SCSI bus, enable termination by installing a jumper on pins 19 and 20 of connector J4A (see Figure 12).

Note. Use active (ANSI SCSI-2 Alternative 2) terminators when terminating the bus.

ST423451WD drives do not have internal terminators or any other way of adding internal termination to the drive. You must provide external differential termination to these drives when ter- mination is required.

J4A

Pin 1

J4B

Pin 1

J4A	Pin 19
Pin 1

Terminator Enabled (TE)

Terminator Disabled (TE)

Figure 12. Terminating the drive (ST423451W shown)