Iridium Transmission Delay
Compared to data loggers utilizing cellular, radio, or Wi-Fi telemetry, Iridium systems have an additional step in
the data upload process which may cause a delay in the time it takes from the logger recording a measurement
to data being posted on WQData LIVE.
Data messages transmitted from the logger’s satellite modem are first packaged as email attachments (SBD
file). WQData LIVE must pull and process these data files from the associated Iridium email server before the
data can be posted to the web.
Server-side restrictions limit the maximum frequency that polling of the Iridium mailbox can occur. Each device
mailbox is checked once every 5 minutes. As a result, there will be at least a 5 minute delay between the
scheduled transmission interval and posting of data to WQData LIVE. Systems which include sensors with long
measurement acquisition times will experience even longer delays.
An example scenario:
An Iridum X2 is set to log and transmit its next reading at 08:00
The reading is initiated and the last sensor completes its measurement at 08:06
The X2 records the new reading internally and signals the system to transmit the data
The Iridum data message is delivered to the email server at 08:07
WQData LIVE polls the mailbox and finds the new data message at 08:10
The 08:00 reading is available to view on the WQData LIVE project shortly after 08:10
This process is illustrated in the diagram below.
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Summary of Contents for X2-CB
Page 11: ...Select sensors from drop down list 11...
Page 17: ...Cellular X2 C to WQData LIVE 17...
Page 18: ...Iridium X2 I to WQData LIVE 18...
Page 19: ...Radio to Cellular X2 RC to WQData LIVE 19...
Page 48: ...Iridium X2 data flow 48...
Page 94: ...Rotate the antenna bushing counterclockwise to remove the antenna 94...
Page 108: ...13 Remove the Main SD Card Main SD Card Location 108...