Sutron X-Link-1 - Message Check

Sutron Corporation X-Link Operations & Maintenance Manual, Rev 1.63 5/24/2016 pg. 61
5.7. Message Check
A message check is the process of using X-Link's modem to see if there are any
messages waiting.
 For IRIDIUMLink, this means getting in touch with the gateway.
 This does incur charges: Every message check will cost money!
 For CDMA, HSPA, and GPRSLink, this means talking to the cell tower to see if
there are any SMS waiting.
Message checking is controlled by a user setting called Msg Interval. This interval
defaults to 24:00:00 and has a range of 00:01:00 to 24:00:00.
Message checking happens even if recording is off!
Message checking will NOT happen if the transmission interval is faster than Msg
Interval. This is because every transmission already includes a message check.
If a unit is setup with a Tx Interval of 1 hour, and a Msg Interval of 15 minutes:
 00:15:00 - Message Check
 00:30:00 - Message Check
 00:45:00 - Message Check
 01:00:00 - Scheduled Transmission - No additional message checking
required
 00:15:00 - Messages Check
With a Tx Interval of one hour and a Msg Interval of 24 hours, no additional
message checking occurs:
 23:00:00 - Scheduled Transmission - No additional message checking
required
 00:00:00 - Scheduled Transmission - No additional message checking
required
 01:00:00 - Scheduled Transmission - No additional message checking
required
The message check serves several purposes:
 It prevents the customer from permanently severing the remote connection.