Communication apparatus

1. A communication apparatus for performing a communication with other communication apparatus by using identification information, comprising:

a housing;

a plurality of grounding terminals which are respectively connected to one end of internal grounding lines provided within the housing, the plurality of grounding terminals for connecting to an external grounding line outside the housing;

a grounding line connection detection section which detects a grounding terminal connected to the external grounding line among the plurality of grounding terminals; and

an identification information setting section which sets the identification information based on a detection result of the grounding line connection detection section,

the apparatus further comprising a plurality of power terminals which are respectively connected to one ends of internal power lines provided within the housing for connecting to an external power line outside the housing; and

a power line connection detection section which detects a power terminal connected to the external power line among the plurality of power terminals,

wherein the identification information setting section sets the identification information based on both of the detection result of the grounding line connection detection section and a detection result of the power line connection detection section.

2. The communication apparatus according to claim 1 , wherein the plurality of grounding terminals are connected to the internal grounding lines via respective diodes whose forward direction is from the internal grounding lines toward the grounding terminals, and are supplied with a predetermined voltage via respective resistors; and

wherein when the electric potential of any of the plurality of grounding terminals is a ground potential, the grounding line connection detection section detects that the grounding terminal whose electric potential is the ground potential is connected to the external grounding line.

3. The communication apparatus according to claim 1 , wherein the plurality of power terminals are connected to the internal power lines via respective diodes whose forward direction is from the power terminals toward the internal power line, and are supplied with the ground potential via respective resistors; and

wherein when the electric potential of any of the plurality of power terminals is a power source voltage, the power line connection detection section detects that the power terminal whose electric potential is the power source voltage is connected to the external power line.

4. A communication apparatus for performing a communication with other communication apparatus by using identification information, comprising:

a housing;

a plurality of power terminals which are respectively connected to one end of internal power lines provided within the housing, the plurality of power terminals for connecting to an external power line outside the housing;

a power line connection detection section which detects a power line connected to the external power line among the plurality of power terminals; and

an identification information setting section which sets the identification information based on a detection result of the power line connection detection section.

5. The communication apparatus according to claim 4 , wherein the plurality of power terminals are connected to the internal power lines via respective diodes whose forward direction is from the power terminals toward the internal power line, and are supplied with the ground potential via respective resistors; and

wherein when the electric potential of any of the plurality of power terminals is a power source voltage, the power line connection detection section detects that the power terminal whose electric potential is the power source voltage is connected to the external power line.