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Using an Existing Non-HP SCSI Card on Windows 95 or Windows NT 4.0 computer

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Introduction
This document describes installing the HP Scanjet 4c scanner on a computer using an existing third-party SCSI interface card already installed in the computer. If you intend to use a third-party SCSI interface card, but have not yet installed it, do so now, before installing the scanner.
To save an accessory card slot, the scanner can be connected to an existing small computer system interface (SCSI) card, or to a series of devices that are attached to this card.
  • In Windows 95, you can use any SCSI card that has a Windows 95 driver. You can see if any such cards are installed by double-clicking the System icon in the Control Panel, and selecting the Device Manager tab.
  • In Windows NT 4.0, you can use any SCSI card that has a Windows NT 4.0 driver. You can see if any such cards are installed by double-clicking the SCSI Adapters icon in the Control Panel.
If you know that you have a SCSI card in the computer but the Setup software did not find it, contact the manufacturer of the card to verify it is installed correctly with the correct driver for your computer. Run the HP scanning software Setup program again after the card and its associated software drivers are installed and working.
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Step 1: Verify cables
Before trying to use an existing card, make sure that you have the correct cables for the installation. Do not connect any cables now. The three types of connectors that may be on your ASPI or CAM card, or on other devices connected to this card are listed in the following table.
CableLengthPart number
SCSI cable (Db25-pin to 50-pin Centronics) 2.0 meters (6.6 feet) 8120-5517
SCSI cable (50-pin Centronics to 50-pin Centronics) 2.0 meters (6.6 feet) 92222C
SCSI-2 cable (mini 50-pin to 50-pin Centronics) 1.5 meters (5.0 feet) K2297
NOTE: The Db25-pin SCSI connector is the same connector that is used for parallel printer output on many computers. Almost every computer has at least one parallel printer output, so make sure that you identify it and avoid connecting the SCSI equipment to it.
The HP interface cable has a Db25-pin SCSI connector at one end and a 50-pin Centronics SCSI connector at the other end. Since this cable is reversible, you can use it to connect to ASPI or CAM cards with either the Db25-pin or the 50-pin Centronics SCSI connector.
If the SCSI card has a mini 50-pin SCSI-II connector
If this is the first external device you are installing, buy the appropriate SCSI cable before you use the ASPI or CAM card. You can install the HP interface card now and reconnect the scanner to the ASPI or CAM card when you have the correct cable.
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Step 2: Set the scanner SCSI address
Each SCSI device is assigned a unique SCSI address from zero to seven (0-7). Most SCSI cards use 7. To confirm which SCSI address that your SCSI card is using, refer to your SCSI card manufacturer’s installation instructions.
NOTE: Do not set both the scanner card and HP Scanjet 4c scanner to the same address.
Make sure that the SCSI address on the scanner does not conflict with the address for any other SCSI device attached to the SCSI card.
Finding available addresses
  1. Restart Windows.
  2. From the Start menu, select Settings, and then select Control Panel.
  3. Double-click the HP Scanjet Scanners icon.
  4. When the HP Scanjet Properties dialog box appears, choose the SCSI tab.
  5. Do not do anything in this dialog box now. You opened it only to find out which SCSI addresses are available. Available addresses are listed at the bottom of the dialog box.
  6. Write down the number of an available SCSI address.
    NOTE: Hard disk drives usually use address 0 or 1, and the SCSI card usually reserves address 7. Do not use these addresses for the HP Scanjet 4c scanner.
  7. Select Cancel to exit the HP Scanjet Properties dialog box.
  8. Exit Windows.
Changing the address switch on the scanner
  1. Turn off the computer.
  2. Make sure that you have turned off the scanner and all other SCSI devices.
    NOTE: The default setting for the SCSI address switch is address 2, so if one of the open addresses was 2, you can skip to the step 3.
  3. Find the SCSI address switch, which is a push wheel rotary switch on the back of the scanner.
    Figure 1: Rear of the scanner (Address and termination switch locations)
  4. Set the SCSI address switch to the empty address you found using the HP SCSI Addresses tool. Increase or decrease the address by using the push buttons above and below the address window on the switch.
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Step 3: Connect the scanner
NOTE: Make sure that your computer and all of your SCSI devices are turned off whenever you connect or disconnect cables.
SCSI devices are installed in a "chain" which is terminated at each end. Terminators are needed because any cable reflects a portion of the electrical signals that reach the end of the cable. The terminator absorbs these reflections to minimize interference with data transfer. Terminate only the first and last device in the SCSI chain. The scanner uses a built-in terminator controlled by a switch on the back of the scanner. See the manufacturer's documentation to find out how to attach or remove terminators from other devices.
The total length of the SCSI chain (including any ribbon cables inside the computer), must be less than 6 meters (about 20 feet). In general, the shorter the SCSI chain the less likely you are to have problems.
You can connect the scanner in any one of the following ways:
  • As the only external SCSI device
  • As the last device in a SCSI chain
  • As a device in the middle of a SCSI chain
As the only external SCSI device
If you have only internal devices, remove or disable the terminators on the internal card before connecting the scanner.
Figure 2: Connecting the scanner (Connecting to either port on the rear of the scanner as the only SCSI device)
  1. See the documentation for your SCSI card to make sure you know how to remove or disable the terminators on the card. Some SCSI card terminations can be disabled with a software utility or an external switch. Plug and Play SCSI cards will automatically disable their own termination when you connect an external device. If you can disable the termination without opening the computer, disable it now and skip to step 7.
    CAUTION: See the documentation supplied with the computer for installation safety instructions.
  2. Turn off the computer and disconnect it from the electrical outlet.
  3. Open the computer so that the accessory card slots are visible.
  4. Remove or loosen the screw that holds the SCSI card in place and remove the card from the computer.
  5. Remove or disable the terminators on the SCSI card.
  6. Reinstall the card and replace or tighten the screw that holds it in place.
  7. Set the terminator switch on the back of the scanner to on (+).
  8. Connect the scanner to the internal card. The figure below shows a typical arrangement.
  9. Go to step 4: Test the Installation.
Figure 3: Connecting the scanner (Connecting the scanner as the last device in a SCSI chain)
Since you already have external SCSI devices, you do not need to open the computer.
  1. Turn off the computer.
  2. Turn off all of the external SCSI devices.
  3. See the manufacturer's documentation for the last device in the SCSI chain to find out how to remove or disable its terminators.
  4. Remove or disable the terminators on the last device in the SCSI chain.
  5. Set the terminator switch on the back of the scanner to on (+).
  6. Plug the appropriate end of the HP SCSI interface cable into the last device on the SCSI chain. This is probably the end with the 50-pin Centronics SCSI connector.
  7. Plug the open end of the HP SCSI interface cable into the appropriate plug on the back of the scanner. You will probably plug the Db25-pin SCSI connector into the matching connector on the scanner.
  8. Go to step 4: Test the Installation.
As a device in the middle of a SCSI chain
Since you already have external SCSI devices, you do not need to open the computer.
Figure 4: Connecting the scanner (Connecting the scanner as a device in the middle of a SCSI chain)
  1. Turn off the computer.
  2. Turn off all the external SCSI devices.
  3. Set the terminator switch on the back of the scanner to off (0).
  4. Disconnect the SCSI cable going into the device that you want to follow the scanner in the SCSI chain. You now have a cable plugged into the next device and an open connector (probably a 50-pin Centronics SCSI connector), which you are holding.
  5. Plug the connector you are holding into the appropriate connector on the back of the scanner.
  6. Connect the HP SCSI interface cable between the scanner and the device from which you unplugged the SCSI chain.
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Step 4: Test the installation
NOTE: If you get an error message while testing the installation, follow the directions in the message.
  1. Make sure that the scanner is unlocked.
    WARNING: This scanner should be operated using a grounded or earthed outlet. Operation of the scanner without an adequate ground connection increases risk of electric shock.
  2. Connect the power cord to the scanner and to an electrical outlet.
  3. Turn on the scanner and all external SCSI devices.
  4. Turn on the computer.
  5. Start Windows.
  6. Copy the HP Scanjet 4c scanner drivers. Insert the HP Scanjet 4c Scanner CD into the compact disc read-only memory (CD-ROM) drive, or the HP DeskScan II disk 1 into the floppy drive.
  7. Make the HP Scanjet 4c scanner the default scanner.
    1. From the Start menu, select Settings and then Control Panel.
    2. Double-click the HP Scanjet Scanners icon.
    3. When the HP Scanjet Properties dialog box appears, choose the General tab.
    4. Select HP Scanjet 4c/3c from the drop-down list if it is not already selected.
    5. Select Make Default to make it the default scanner.
    6. Leave open the HP Scanjet Properties dialog box.
  8. Run the HP Scanner Test.
    1. Select the Test tab in the HP Scanjet Properties dialog box.
    2. Select Scanner.
    3. Follow the directions on the screen.
    4. If the scanner passes its self-test, select OK and then OK to close the HP Scanjet Properties dialog box.
  9. You have completed your installation, now you can start scanning. Use the HP DeskScan II User's Guide or the Help file within the HP DeskScan software to learn more about the software.
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