Configuration - HP 340 Series Service Manual

Configuration
SCSI Node Address. Each device on a SCSI bus rnust have a unique address from zero to seven,
called the node address. The SCSI card is fixed at Node Address
o.
SCSI Bus Termination. The SCSI bus must be terminated at both ends. The SCSI circuit
furnishes termination for the SPU end of the bus. Peripheral devices must have either no
termination or optional termination, except that one peripheral device may be permanently
terminated, provided that it goes on the end of the bus. Termination for devices with no
termination is provided by the terminator included in the product. It is installed in the empty
cable connector on the end device.
Parity. The SCSI card's parity configuration switch selects odd parity when set to OPEN. Data
received with incorrect parity is logged as an error.
Select Code. Five configuration switches set the select code from 0 to 31.
Interrupt Level. Two configuration switches set the interrupt level from 3 through 6.
Adding or Removing a Device. You may want to rernove a device or substitute one for another
as part of the troubleshooting process (such as to confirm that a particular device is defective),
but don't want to shut the HP-UX system down to do it. Here is how to add or remove a device
without shutting down and turning off the system each time:
To remove a device:
1. Use the
unmount
command to unmount the device from the HP-UX operating system.
2. Turn off power to the device.
3. Disconnect the device from the SCSI bus.
If you are not going to add a device in the place of the one which you just removed, be sure
to reconnect the bus. If the removed device was on the end, make sure that you move the
termination to the previous device on the bus.
To add a device:
1. Connect the device to the SCSI bus.
2. Turn on power to the device.
3. Use the
mount
command to mount the device.
64 Functional Description