Instructions

UM-0085-B09 DT80 Range User Manual Page 225
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If the DT80's modem is used to connect to a private wide area network (as opposed to the Internet) then a DNS server
might not be available. If this is the case then "ping" may be used as an alternative network check mechanism. To enable
this you need to set the
NETWORK_CHECK profile, and configure a comma-separated list of one or more servers that
you know will respond to a ping. For example:
PROFILE MODEM_SESSION NETWORK_CHECK=PING
PROFILE MODEM_SESSION PING_SERVERS=192.168.10.22
To disable the network check feature, use
PROFILE MODEM_SESSION NETWORK_CHECK=NONE
 Retries
If a retry is required following a session failure, the DT80 will wait for a period of time then start a new session. The
timing of these session retries is configurable, using the following profile setting:
PROFILE MODEM_SESSION RETRY_DELAY_S=n
where n is the minimum delay, in seconds, between a communications session failing and the DT80 attempting to start a
new one. The default setting is 30 seconds. Every third attempt, this delay will be increased by a factor of 60
, to allow
some extra time for the problem to be resolved.
If there are queued items to send, or if we are inside a configured communications time window, then session retries will
continue indefinitely
, until either
• a session can be established successfully, or
• the session is no longer required (e.g. we are now outside the time window, or the user manually cleared the
pending data/alarm transmissions using the
SESSION CLEAR command; see SESSION Command (P227)).
If, on the other hand, the session was started manually using the
SESSION START command, then a maximum of 4
retries will be performed, after which the session will be abandoned.
 dEX Settings
In the dEX Configuration Builder, the session error handling settings can be found under Modem, on the Session
connection tab, as shown in Figure 84.
Figure 88: Session error handling settings
FTP Failures
A data unload to an FTP server, e.g.
COPYD dest=ftp://freddo:[e-mail]/data/
may fail because of:
• a configuration error, e.g. an incorrectly specified username, password, server name or folder name
• a server problem, e.g. the FTP server may be down or overloaded
• a network problem, e.g. the modem's connection to the mobile network has dropped out.
 Retries
If any error is detected during the FTP transfer, the DT80 first determines whether the network is still functional. If the
network has failed (e.g. the modem has dropped out, or the DNS/ping network check fails) then this is a session failure
and will be dealt with as described in Session Failures(P224).