Communication system, communication device, and communication program

A communication device functioning as a master device that is communicably connected to a plurality of slave devices via a communication line, comprising:

• a processor configured with a program to perform operations comprising:
• operation as a setting unit that sets an address in an added slave device from an original address to a prescribed address based on a position of the added slave device in a topology comprising a plurality of the slave devices;
• operation as a judging unit that judges whether a change has occurred in the topology in response to the prescribed address being set in the added slave device by the setting unit;
• operation as a specifying unit that, in response to an erroneously set slave device having an address that was erroneously set by the setting unit, specifies the erroneously set slave device, in response to the judging unit judging that the change has occurred in the topology;
• and
• operation as a resetting unit that resets the address set in the erroneously set slave device specified by the specifying unit to an original address of the erroneously set slave device.

A non-transitory computer-readable storage medium storing a communication program that is executed in a communication device functioning as a master device that is communicably connected to a plurality of slave devices via a communication line, the communication program causing a processor of the communication device to perform operations comprising:

• setting an address in an added slave device from an original address to a prescribed address based on a position of the added slave device in a topology that is composed of a plurality of the slave devices;
• judging whether a change has occurred in the topology in response to the prescribed address being set in the added slave device;
• in response to an erroneously set slave device having an address that was erroneously set, specifying the erroneously set slave device, in response to judging that the change has occurred in the topology;
• and
• resetting the address set in the specified erroneously set slave device to an original address of the erroneously set slave device.