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System Management Concepts:
Operating System and Devices
Device Location Codes
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 connector 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.
Adapter Location Codes
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. |
Printer and Plotter Location Codes
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. |
tty Location Codes
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. |
SCSI Device Location Codes
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. |
Direct-Bus-Attached Disk Location Codes
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.
Serial-Linked Disk Location Codes
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 Drive Location Codes
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.
Dials/LPFKeys Location Codes
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.
Multiprotocol Port Location Codes
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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