HP 24SII manual

2.Remove the appropriate I/O module by loosening the 2 straight- slot screws that connect the back panel of the I/O module to the chassis and then pulling the module out.

3.If upgrading a serial module, locate socket U3 on the appropriate I/O module (see Appendix D.7). If upgrading the M24SII-V02 parallel module, locate socket U6 on the module (see Appendix D.6).

4.Remove existing EPROM from the appropriate socket with IC extractor or needle-nose pliers. Gradually loosen each side of the chip, alternating pliers from side to side, so as not to bend chip pins. Pull loosened EPROM all the way out.

5.Install new EPROM into the appropriate socket. The EPROM is notched; the notch on the EPROM should line up with the notch on the socket. When installing the new chips, be careful not to bend any of the pins. Make sure none of the pins miss their sockets. Also make certain that you install the correct EPROM into the appropriate I/O module.

6.If more than one I/O module is installed into the Model 24SII, locate the appropriate socket on those modules and follow the procedures listed above under steps 2 through 5. Again, refer to the label on the EPROMs to verify that you are installing the correct EPROM into the module.

7.Re-install the module(s) as described in Appendix B.1 and apply power to the unit. The upgrade is now complete.

Before you begin operations, check the Model 24SII's configuration status to make certain it matches your application. If configuration changes (baud rates, handshaking, etc.) are required, you must make

￿￿￿these changes in the configuration mode. See Section 8 for complete instructions.