Instructions

UM-0085-B09 DT80 Range User Manual Page 224
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 dEX Settings
In the dEX Configuration Builder, the session timing settings can be found under Modem, on the Power tab, as shown in
Figure 87.
Figure 87: Session timing setting
A daily time window can be defined by selecting Periodically and entering the start and stop time. The other "cron" fields
(e.g. day of week) are not supported in dEX.
Error handling
Power supplies, communications links, networks and file servers are often imperfect. Communications sessions provide
a mechanism for automatically handling many common errors that may arise, without the need for special handling in
your DT80 job.
In the event of a failure to establish a network connection, or a disconnection mid-session, the DT80 will generally
attempt to establish a new session, and perform periodic retries as required. Similarly, if an FTP or email data transfer
fails then it will be automatically retried.
Session Failures
There are many reasons why a session might not be able to be established successfully, as indicated in the table in
Communication Errors (P217) above. In the event of any error, the DT80 will automatically retry the session.
A session failure occurs when:
• the session never starts, e.g. it cannot connect to the mobile network or the Internet, or
• the modem signals that it has detected an error or has lost signal during a session, or
• the periodic "network check" test fails (see below).
 Connection Timeout
The following profile setting specifies the maximum time (in seconds) to wait when registering on the mobile network:
PROFILE MODEM REGISTRATION_WAIT_S=60
If this time expires without the DT80 being able to register on a mobile network, then it will reset the modem to automatic
network selection (as opposed to reconnecting the last used network), and repeat the registration sequence. This means
that the timeout may appear to be effectively double the time specified above.
 Network Check
The network check (a.k.a. "heartbeat") is used to detect cases where the modem is still connected to the mobile
network, but for one reason or another has lost Internet connectivity.
By default, the DT80 verifies its network connection by periodically contacting the network Domain Name System (DNS)
server. The DNS server address is provided to the DT80 by the mobile network, so no configuration is required.