Panasonic GT02 Manual page 8

(3) Two-Way 2 mode
In the two-way 2 mode, an external device sends a command to the GT, and the GT sends a message
for transmitting the information on the switch input/data settings. In this mode, the GT sends back a
response for a command to the external device.
The external device and the GT both have the transmission right. Therefore, the external device waits for
the message transmission from the GT by interruption, etc., in order to receive a message for
transmitting the information on the switch input/data settings.
Key Point: In the two-way 2 mode that the response function is available, the external device can
detect errors because no response is returned.
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