52 (148)
Connection Supervision
The connection supervision will try to connect to the first URL whenever there has been no
payload traffic for the given period of time. The period can be specified between 60 and 60000
seconds. If connecting to the first URL fails, the second URL will be tried. If the second URL fails,
too, the cellular modem connection will be re-established. Use this function if you fear there
might be connection problems not recognised by the cellular modem driver. But note that this
function may produce additional network traffic. Note that the connection supervision may not
be disabled, if the cellular modem connection is used as a fallback connection (see above).
For applications that require continuous data collection (for example the PORTAL or a
telecontrol protocol) the connection supervision has to be enabled. This function
supervises the cellular modem connection and resets the modem when the connection is
broken. Also note that the predefined supervision URLs are only reachable with SIM cards
that allow access to the internet.
When the cellular modem connection is used as a fallback connection, the connection
supervision URLs must resolve to IP addresses that are not used by any other component
of the device, because these addresses may not be reachable while the connection
supervision is checking disconnected network interfaces.
Portal
The cellular modem driver will transmit the RSSI, the data service type and the SIM ID to the
portal. The data service type is transmitted numerically. The values have the following meaning:
0
No data service
1
GPRS
2
EDGE
3
UMTS
4
UMTS with HSDPA
5
UMTS with HSUPA
6
UMTS with HSDPA and HSUPA
Also the GPS coordinates latitude, longitude and altitude will be transmitted. If the GPS module
cannot provide a horizontal fix, the quality for latitude and longitude will be set to
bad
. The same
applies to the altitude's quality, if the GPS module cannot provide a vertical fix.
GPS
If the cellular modem built into your Anybus Edge device features a GPS module, you can enable
the GPS module. Once enabled, the GPS module will provide the coordinates latitude, longitude
and altitude. Please note that getting the coordinates may take several minutes as long as the
module does not have any knowledge of its position (cold start). This does not affect any data
connection, but neither the RSSI can be determined nor short messages can be sent or received
while the driver queries the GPS module.
Base Station Assisted Location
If the "Base station assisted location" option is enabled, the devices' location will be determined
by triangulating the base stations with which the device is connected.
Using GPS and base station assisted location simultaneously is not possible.
The device handles base station assisted location requests automatically. It will send up to three
requests at system start until the highest location certainty has been archived. After system start
it will send a request each hour. This service can only be used for up to 1000 requests per
calendar month. If the maximum number of requests to this service is exceeded acquiring the
devices' position will be no longer possible.
Anybus Edge Gateway Reference Guide
SCM-1202-154 1.0 en-US
