| 摘要 |
<p>PURPOSE:To confirm the mounting number of slave substrate by measuring potential for which partial pressure is performed by constituting the potential to be taken out from a presectibed location of a partial pressure circuit formed within a master substrate and a slave substrate so as to be different according to the mounting state of the slave substrate when both of the master substrate and the slave substrate are connected. CONSTITUTION:A signal line 3 connected with the slots #1 to #3 of a master substrate 1 is installed via a resistance R0 and is connected with an A/D converter 5. A pull-up is performed for the other scheduled bits of the slots #1 to #3 via resistances R1 to R3. The bits of a connector 6 of a slave substrate 2 corresponding to the bits for which the pull-up is performed are connected by a conductor 1. When the slave substrate 2 is connected with the master substrate 1, the potential of a x point for which partial pressure is performed by the combined resistance of the resistances R1 to R3 and the resistance R0 is fetched into a CPU 5 via the A/D converter 5. By measuring this potential, the presence or absence of the mounting of the slave substrate 2 every slot can be detected.</p> |
