Everet EVP412N, Руководство пользователя

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Controller will save sequence number of each command, when one command sent, the sequence
number of the command will add 1, when the sequence number becomes the max value, it will
change to 0 for next time. The peripheral equipment will save sequence number of each command,
and return the sequence number to the controller.
Payload
According to Payload type, the following data will be saved.
●
VISCA command
○
Save VISCA command packet
●
VISCA inquiry
○
Save VISCA message packet
●
VISCA reply
○
Save VISCA return packet
●
VISCA device setting command
○
Save VISCA equipment setting command packet.
Control command
The following data is saved in control command payload
Controlled reply
The following data is saved in return command payload of control command.
Delivery confirmation
VISCA over IP uses UDP as transmission communication protocol, UDP communication message
transmission is not stable. It is necessary to confirm delivery and resent in application.
Generally, when controller sends a command to peripheral equipment, controller will wait for the
return message then send the next command, we can detect and confirm if the peripheral equipment
received the commands from return message’s lag time. If controller shows it is overtime, it will be
marked as error transmission.