Select In Broadcast Mode (W)
| Function | Selects the device as the target in broadcast out-of-band UDP programming |
| Can be issued through | Network (broadcasts OK, login not required) |
| Command format | Wmmm.mmm.mmm.mmm.mmm.mmm, where mmm.mmm.mmm.mmm.mmm.mmm- MAC-address of the target device |
| Possible replies | A |
Select In Broadcast Mode command is used to pre-select a certain device for subsequent programming via broadcast out-of-band (UDP) commands. Only a small portion of device commands (such as Echo (X) ) are accepted when sent in broadcast UDP datagrams. All other commands are only accepted if they address a specific device. Such specific addressing normally involves sending UDP datagrams with the IP-address of the targeted device as the destination (i.e. non-broadcast datagrams). This requires the IP-address of the device to be configured reachable which is not always possible or convenient.
Select In Broadcast Mode command provides a way around this. Target device, referenced by its MAC-address, is first pre-selected using this command. After that, all broadcast commands that are normally ignored when sent as broadcasts, are not ignored and processed by this pre-selected device.
When Select In Broadcast Mode command is issued all devices whose MAC-addresses do not match the target MAC-address supplied in the command body de-select themselves. This means that to switch onto programming of another DS in the broadcast mode, you need to send the new Select In Broadcast Mode command with the new target MAC-address. This will pre-select a different device while at the same time de-selecting the device that was selected before. To de-select all device on the network send Select In Broadcast Mode command with no MAC-address field.
This command only influences which device responds when it is addressed using broadcast UDP commands. Command has no influence over any other form of programming that involves addressing the device by its IP-address.
The only possible reply to this command is OK (A) . It is issued by the device that has recognised its MAC-address in the command body. If no device on the local network recognizes its MAC then there will be no reply received to this command.