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AIX Version 4.3 System Management Guide: Operating System and Devices

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.

A drawer's location code consists of only the drawer field and is simply a two-character code. An adapter's location code consists of the drawer and slot fields and has the format AA-BB, where AA corresponds to the drawer's 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:

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 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 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/Plotter Location Codes

Location codes of 00-00-S1-00 or 00-00-S2-00 indicate the printer or plotter 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 the printer or plotter is connected to an adapter card other than the standard I/O board. For these printers and plotters, 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 or plotter 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 will indicate the tty device which 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

All SCSI devices including:

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 card's SCSI bus that the device is attached to. For a card that provides only a single SCSI bus, this field will be set to 00. Otherwise, a value of 00 indicates a device attached to the card's internal SCSI bus and a value of 01 indicates a device attached to the card's external SCSI bus.
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's diskette ports 0 or 1.

Dials/LPFKeys Location Codes

For a graphics input adapter attached Dials/LPFKeys device, 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 will be either 01 or 02, depending on whether the device is attached 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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