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Wireless solution
WS403 interfaces transmit data available on a CAN bus via GSM telecommunication services and GPRS. In
addition to data transmission via GSM/GPRS, the WS devices use the EDGE, 3G and HSDPA standards to
reduce data transmission latency and to improve data transfer rate.
GPS
The device includes a GPS receiver for determining position data.
The GPS enables the devices to determine their position using the Global Positioning System. The
position data can then be transmitted via GSM/3G to another GSM/PSTN/ISDN/3G device, or made it
available to the connected CAN bus system.
GPRS/EDGE/3G/HSDPA
All WS403 devices feature GPRS/ EDGE/3G/HSDPA services. Beyond the GSM functionality, these services
allow for communication with web servers at higher data rates. The communication is based on the
TCP/IP protocol. Using these services requires a connection to a specific Danfoss server.
Operating modes
WS devices can be operated in the following modes:
•
Real-time mode
•
Data Logging / File Transfer mode
Real-time mode
CAN messages are received by the device and sent via the Danfoss Web portal server to the remote PC.
On this computer there may be an analysis software which can handle the CAN messages. A bi-
directional data transfer is possible. When higher layer protocols are used, a special firmware and
software adaptation may be necessary due to the delay times caused by the GSM/3G network. For this
operation a permanent connection (GSM/3G coverage) is necessary.
Data logging / File-transfer mode
In this operation mode the WS unit logs specific CAN messages and GPS position data according to its
configuration and sends them in a special format to the Danfoss server. The WS devices have an internal
non-volatile memory which allows to store the files in case of a GSM outage. When the connection is
recovered the files are sent to the server automatically.
Technical Information
WS 403 Remote Solution
Device functions
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Danfoss | March 2016
L1426375 | BC00000241en-US0203 | 15