Patent ID: 8576424

Claim:
A printing system comprising: a plurality of devices including a device that prints on printing paper; a plurality of device control units that respectively control the plurality of devices; and a central control unit that centrally controls the plurality of device control units; wherein when the central control unit detects a problem in at least one of the plurality of devices, the central control unit sends a stop device command for stopping devices in which a problem is not detected as a command to be processed immediately to device control units that control the devices in which a problem is not detected, the device control units that received the stop device command execute a process based on the stop device command with priority over processes based on other commands to stop the devices in which a problem is not detected, an image printer that prints images on a front side, which is one side of the printing paper, and a reverse printer that prints text on a reverse side, which is another side of the printing paper, as devices that print on the printing paper; and a reverse printing control unit that controls the reverse printer as a device control unit; wherein when the central control unit detects a problem with the image printer, the central control unit sends the stop device command for stopping the reverse printer to the reverse printing control unit; and the reverse printing control unit executes a process based on the stop device command with priority to processes based on other commands, and stops the reverse printer.