General tips and tricks for troubleshooting

No data received on connect

After a connection has been established and data transfer enabled, the first thing the IEC 104 module does is send an general interrogation command for all devices available on the server. Some servers has been observed not to support this, and does not reply on the interrogation command. The user can then try to create a interrogation command for a specific device, and if that succeeds, can automate an interrogation command e.g. after each time a connection has been established by utilizing the state and function items:

1. Add an interrogation item with the device to interrogate (CA)
2. Add a function item
3. Add the #Connected# state item as external item
4. When #Connected# is true, increment the value of the function item
5. Set the function item as external item for the interrogation command