Relay device and medical device

A relay device for being used in a medical device including a first device and a plurality of second devices, the second devices each performing control signal communication with the first device, and for relaying the control signal communication between the first device and the second devices, the relay device comprising:

• a programmable logic device including:
• a first interface configured to communicate with the first device in a communication scheme corresponding to a communication scheme of the first device;
• and
• a plurality of second interfaces each configured to perform communication with the respective second devices in communication schemes corresponding to communication schemes of the second devices;
• and
• a plurality of pairs of a first memory and a second memory, wherein the pairs of the first memory and the second memory are provided in each of the second interfaces,
• the programmable logic device temporarily stores a first control signal received from the first device via the first interface in the first memory at a first communication timing, and transmits the first control signal to the second device via the second interface at a second communication timing, and temporarily stores a second control signal received from the second device via the second interface in the second memory at a third communication timing, and transmits the second control signal to the first device via the first interface at the first communication timing, and the first communication timing and the second and the third communication timings are set at timings shifted from one another, and the first communication timing, the second communication timing, and the third communication timing are changeable according to a setting stored in the programmable logic device,
• wherein the setting is set according to processing speeds in the first device and the plurality of second devices, and wherein the setting is further set according to a data amount of the control signal communication.