8.5.4 Message FlowBelow are some examples of typical message flows for various interactions with the sensor.Discovery of a Sensor1. PC broadcasts a DISCOVER messageOnly the header values need to be filled• Protocol ID field should be set to 0x6956752b, “iVu+"• Message Type field should be set to 0x44495343, “DISC”• Correlation tag should be set by the sender to the non-zero value that will allow the senderto identify the response.The packet with the header values is sent out using the broadcast address of 255.255.255.255NOTE: Not all the switches are configured to pass broadcast packets by default. A switchconfiguration change may be necessary to enable the passing of broadcast packets.2. Upon receipt of the broadcast message the sensor performs the following:Sensor verifies that the message is addressed to it by comparing Protocol ID field to value 0x6956752b.• If the value matches, the sensor examines the Message Type field.> If the value does not match any of the commands, the sensor discards the packet.> If the Message Type field matches 0x44495343, “DISC”, the sensor prepares the responsein the form of DISCOVER_REPLY packet:- Protocol ID field is again set to 0x6956752b, “iVu+”- Message Type field is set to 0x52504c59, “RPLY”- Correlation Tag is copied from the received message- Body of the message is populated with the following fields, with fields separatedby a comma:iVu Plus TG Gen2 Image Sensorwww.bannerengineering.com - Tel: 763.544.3164 103
