Patent ID: 11954054
Assignee: TOSHIBA CARRIER CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC G  H  F | IPC G  H

Claim 0:
1. A communication system comprising:
a master unit; and
a plurality of slave units including a slave unit to which a termination resistance is set, the plurality of slave units being connected to the master unit via a communication line, wherein
the master unit includes a master communication control unit that normally sets a communication rate of communication performed with the plurality of slave units to a high baud rate, switches the high baud rate to a low baud rate after detecting that communication with the slave unit to which the termination resistance is set is disabled, transmits an instruction for switching the low baud rate to the high baud rate to the plurality of slave units after detecting that the communication with the slave unit to which the termination resistance is set is restored, and switches setting of the master unit itself to the high baud rate,
each of the plurality of slave units includes a slave communication control unit that normally sets a communication rate of communication performed with the master unit to a high baud rate, switches the high baud rate to a low baud rate after detecting that the communication with the master unit is disabled, and switches the low baud rate to the high baud rate after receiving, from the master unit, an instruction for switching the low baud rate to the high baud rate,
each of the slave units includes a resistance that can be connected to the communication line as the termination resistance, a memory that stores termination resistance setting information indicating whether each of the slave units is a target to which the termination resistance is to be set, and a switching circuit that electrically switches between connection and non-connection of the termination resistance to the communication line, and
the slave communication control unit switches between connection and non-connection of the resistance to the communication line by the switching circuit based on the termination resistance setting information stored in the memory.