Medium Optical Disk (RW551/RW552) Library
6–8
EK–MOL80–SV. B01
The autochanger communicates to the PCA through a GPIO bus.
The differential and single-ended connectors are on the top of the PCA and the
single-ended bus connection to the jukebox are on the bottom. A slider switch
between the two external connectors selects which type of input will be accepted.
Four jumpers select the configuration for termination alternatives (listed from
left to right as seen at the bottom of the diagram):
•
J6 – enable/disable differential host TERMPOWER. PIN 1 and 2 jumpered
together allows the PCA to provide TERMPOWER to the differential external
[host] SCSI bus (default).
•
J5 – enable/disable internal bus TERMPOWER. PINS 1 and 2 jumpered
together allows the PCA to provide TERMPOWER to the internal SCSI bus
(default).
•
J4 – bus terminator configuration. PIN 1 and 2 jumpered together enable bus
termination (default). When enabled, active termination is supplied for the
internal bus at this PCA; termination at the other end of the SCSI cable is by a
clamp terminator attached to the SCSI cable near the last drive connection.
•
J1 – enable/disable single-ended host TERMPOWER. PIN 1 and 2 jumpered
together allows the PCA to provide TERMPOWER to the single-ended
external [host] bus (default).
Figure 6–5 SCSI Repeater/Converter/LUN PCA – 4X-Drive Versions
