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System Management Concepts: Operating System and Devices
The location code is a
path from the CPU drawer or system unit through the adapter, signal cables,
and the asynchronous distribution box (if there is one) to the device or
workstation. This code is another way of identifying physical
devices.
The location code consists of up
to four fields of information depending on the type of device. These
fields represent drawer, slot, connector, and port. Each of these
fields consists of two characters.
The location code of a drawer
consists of only the drawer field and is simply a two-character code.
The location code of an adapter consists of the drawer and slot fields and has
the format AA-BB, where AA corresponds to the drawer
location and BB indicates the bus and slot that contains the
adapter. Other devices have location codes of formats
AA-BB-CC or AA-BB-CC-DD, where AA-BB is the
location code of the adapter to which the device is connected, CC
corresponds to the connecter on the adapter to which the device is connected,
and DD corresponds to a port number or SCSI device address.
For information on finding the
labels with the location codes on the hardware, see your operator
guide.
The following devices contain location codes and are discussed in this
section:
The location code for an adapter
consists of two pairs of digits with the format AA-BB, where
AA identifies the location code of the drawer containing the
adapter and BB identifies the I/O bus and slot containing the
card.
A value of 00 for the
AA field means that the adapter is located in the CPU drawer or
system unit, depending on the type of system. Any other value for the
AA field indicates that the card is located in an I/O expansion
drawer. In this case, the AA value identifies the I/O bus
and slot number in the CPU drawer that contains the asynchronous expansion
adapter. The first digit identifies the I/O bus with 0
corresponding to the standard I/O bus and 1 corresponding to the
optional I/O bus. The second digit identifies the slot number on the
indicated I/O bus.
The first digit of the
BB field identifies the I/O board containing the adapter
card. If the card is in the CPU drawer or system unit, this digit is
0 for the standard I/O bus and 1 for the optional I/O
bus. If the card is in an I/O expansion drawer, this digit is
0. The second digit identifies the slot number on the
indicated I/O bus (or slot number in the I/O expansion drawer) that contains
the card.
A location code of
00-00 is used to identify the standard I/O board.
Examples:
| 00-05
| Identifies an adapter card in slot 5 of the standard I/O board and is
located in either the CPU drawer or the system unit, depending on the type of
system.
|
| 00-12
| Identifies an adapter in slot 2 of the optional I/O bus and is located in
the CPU drawer.
|
| 18-05
| Identifies an adapter card located in slot 5 of an I/O expansion
drawer. The drawer is connected to the asynchronous expansion adapter
located in slot 8 of the optional I/O bus in the CPU drawer.
|
Location codes of
00-00-S1-00 or 00-00-S2-00 indicate the printer,
plotter, or tty device is connected to the standard I/O board serial ports
s1 or s2. A location code of
00-00-0P-00 indicates the parallel printer is connected to the
standard I/O board parallel port.
Any other location code indicates
that the printer, plotter, or tty device is connected to an adapter card other
than the standard I/O board. For these printers, plotters, and tty
devices, the location code format is AA-BB-CC-DD, where
AA-BB indicates the location code of the controlling
adapter.
| AA
| A value of 00 for the AA field indicates the
adapter card is located in the CPU drawer or system unit depending on the type
of system. Any other value for the AA field indicates the
card is located in an I/O expansion drawer; in which case, the first
digit identifies the I/O bus and the second digit identifies the slot number
on the bus, in the CPU drawer, that contains the asynchronous expansion
adapter to which the I/O expansion drawer is connected..
|
| BB
| The first digit of the BB field identifies the I/O bus
containing the adapter card. If the card is in the CPU drawer or system
unit, this digit is 0 for the standard I/O bus and 1 for
the optional I/O bus. If the card is in an I/O expansion drawer, this
digit is 0. The second digit identifies the slot number on
the I/O bus (or slot number in the I/O expansion drawer) that contains the
card.
|
| CC
| The CC field identifies the connector on the adapter card
where the asynchronous distribution box is connected. Possible values
are 01, 02, 03, and 04.
|
| DD
| The DD field identifies the port number on the asynchronous
distribution box where the printer, plotter, or tty device is attached.
|
Location codes of
00-00-S1-00 or 00-00-S2-00 indicate the tty device is
connected to the standard I/O serial ports s1 or
s2.
Any other location code indicates
the tty device is connected to an adapter card other than the standard I/O
board. For these devices, the location code format is
AA-BB-CC-DD, where AA-BB indicates the location code of
the controlling adapter card.
| AA
| A value of 00 for the AA field indicates the
adapter card is located in the CPU drawer or system unit depending on the type
of system. Any other value for the AA field indicates the
card is located in an I/O expansion drawer. In this case, the first
digit identifies the I/O bus, and the second digit identifies the slot number
on the bus in the CPU drawer that contains the asynchronous expansion adapter
where the I/O expansion drawer is connected.
|
| BB
| The first digit of the BB field identifies the I/O bus
containing the adapter card. If the card is in the CPU drawer or system
unit, this digit will be 0 for the standard I/O bus and
1 for the optional I/O bus. If the card is in an I/O
expansion drawer this digit is 0. The second digit
identifies the slot number on the I/O bus (or slot number in the I/O expansion
drawer) that contains the card.
|
| CC
| The CC field identifies the connector on the adapter card
where the asynchronous distribution box is connected. Possible values
are 01, 02, 03, and 04.
|
| DD
| The DD field identifies the port number on the asynchronous
distribution box where the tty device is attached.
|
These location codes apply to all
SCSI devices including:
- CD-ROMs
- Disks
- Initiator devices
- Read/write optical
drives
- Tapes
- Target mode
The location code format is
AA-BB-CC-S,L. The AA-BB fields identify the
location code of the SCSI adapter controlling the SCSI device.
| AA
| A value of 00 for the AA field indicates the
controlling adapter card is located in the CPU drawer or system unit,
depending on the type of system.
|
| BB
| The BB field identifies the I/O bus and slot containing the
card. The first digit identifies the I/O bus. It is 0
for the standard I/O bus and 1 for the optional I/O bus. The
second digit is the slot on the indicated I/O bus containing the card.
A value of 00 for the BB field indicates the standard
SCSI controller.
|
| CC
| The CC field identifies the SCSI bus of the card that the
device is attached to. For a card that provides only a single SCSI bus,
this field is set to 00. Otherwise, a value of 00
indicates a device attached to the internal SCSI bus of the card, and a value
of 01 indicates a device attached to the external SCSI bus of the
card.
|
| S,L
| The S,L field identifies the SCSI ID and logical unit number
(LUN) of the SCSI device. The S value indicates the SCSI ID
and the L value indicates the LUN.
|
For a direct-attached disk
device, the location code format is AA-BB. The AA
field is a value of 00, that indicates the disk is located in the
system unit. The BB field indicates the I/O bus and slot
number where the disk is attached. The first digit is always
0, which indicates the disk is attached to the standard I/O
bus. The second digit identifies the slot number on the standard I/O
bus to which the disk is attached.
The location code for
serial-linked disk drives is of the format AA-BB-CC-DD, where
AA-BB indicates the location code of the controlling adapter
card.
The individual fields are
interpreted as follows:
| AA
| A value of 00 for the AA field indicates the
controlling adapter card is located in the CPU drawer or system unit,
depending on the type of system.
|
| BB
| The BB field identifies the I/O bus and slot containing the
card. The first digit identifies the I/O bus. It is 0
for the standard I/O bus and 1 for the optional I/O bus. The
second digit is the slot on the indicated I/O bus that contains the
card.
|
| CC
| The CC field identifies the connector on the adapter card
where the controller drawer is attached. Possible values are
00, 01, 02, and 03.
|
| DD
| The DD field identifies the logical unit number (LUN) of the
disk. This corresponds to the slot in the drawer where the disk
resides.
|
Diskette drives have location
codes of either 00-00-0D-01 or 00-00-0D-02, indicating
that they are attached to the standard I/O planar diskette ports 0
or 1.
For a Dials/LPFKeys device
attached to a graphics input adapter, the location code format is
AA-BB-CC.
The individual fields are
interpreted as follows:
| AA
| A value of 00 for the AA field indicates the
controlling adapter card is located in the CPU drawer or system unit,
depending on the type of system.
|
| BB
| The BB field identifies the I/O bus and slot containing the
card. The first digit identifies the I/O bus. It is 0
for the standard I/O bus and 1 for the optional I/O bus. The
second digit is the slot on the indicated I/O bus that contains the
card.
|
| CC
| The CC field indicates the card connector where the device is
attached. The value is either 01 or 02, depending
on whether the attached device is port 1 or port 2 on
the card.
|
Note:
Serially attached Dials/LPFKeys devices do not indicate location codes.
This is because these devices are considered to be attached to a tty
device. The tty device is specified by the user during Dials/LPFKeys
definition.
The location code for a
multiprotocol port is of the format AA-BB-CC-DD where
AA-BB indicates the location code of the multiprotocol adapter
card.
The individual fields are
interpreted as follows:
| AA
| A value of 00 for the AA field indicates the
multiprotocol adapter card is located in the CPU drawer or system unit,
depending on the type of system.
|
| BB
| The BB field identifies the I/O bus and slot containing the
card. The first digit identifies the I/O bus. It is 0
for the standard I/O bus and 1 for the optional I/O bus. The
second digit is the slot on the indicated I/O bus that contains the
card.
|
| CC
| The CC field identifies the connector on the adapter card to
which the multiprotocol distribution box is connected. The value is
always 01.
|
| DD
| The DD field identifies the physical port number on the
multiprotocol distribution box. Possible values are 00,
01, 02, and 03.
|
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