User's Manual

D-1
Appendix D
Firmware Upgrades
Base Station & Relay Firmware upgrades
Occasionally it is necessary to get firmware fixes for problems discovered
with the R/F Terminal System, especially in the early stages of devel-
opment. This is accomplished by replacing the existing EPROM chip on
the board of the R/F Base Station or Relay with a new chip.
To replace the EPROM:
• Remove the cover to the Base Station or Relay (see Appendix A for
diagrams and details)
• Remove the EPROM, (the chip with the Copyright label on it), by
gently prying with a small flat head screwdriver, alternating ends to
keep from bending the metal legs.
• Before inserting the new EPROM, notice that the EPROM has a small
groove in one end; the end with the groove in it must match the
groove in the socket that it is to be inserted into. Don't insert the chip
backwards -- line up the groove in the chip to be on the same side as
the socket's groove.
• You may need to slightly bend into the center the legs of the EPROM
so that they can be inserted into the socket. Place the chip into the
socket and begin to lightly push the chip into the socket. Unless you
check, you may bend one of the leads not in a hole underneath the
chip -- making your Reader dysfunctional. Once you are sure all legs
are positioned into the holes correctly, you can push hard until the
chip is firmly positioned into the socket.
• After turning the re-powering the R/F Base or Relay, you should see the
LED flash the number of time equal to the frequency assigned. This
indicates that the EPROM has been successfully installed. If it doesn't
flash, remove the EPROM and check for bent legs. Also be certain you
have not placed it in upside down, (not matching the notches).