Operating Manual V25/09.2019
Ventus / Ventus-X / V200A
Chapter 20 Appendix 45
20.5 Communication in NMEA Protocol
Wind direction and wind speed in accordance with NMEA protocol can be requested via the
NMEA protocol.
To do this, in the device configuration, interface settings, the protocol mode must be set to
NMEA (see page 25).
NMEA protocol is network-compatible and serves exclusively for online data requests. The
device will not respond to incomprehensible NMEA commands.
Note: The use of binary protocol is recommended for lengthy transmission routes (e.g. network,
GPRS/UMTS), as NMEA protocol is unable to detect transmission errors (not CRC-secured).
Note: In the NMEA protocol, data output is available by means of NMEA telegram only.
In the NMEA protocol, it is possible to control the telegram output by means of the control line
when using full duplex operation (see page 20).
20.5.1 Structure
An NMEA command is initiated by the ID and concluded with the CR sign (0Dh). Characters
that represent an ASCII value are in ordinary inverted commas.
20.5.2 ID
The NMEA-ID is derived from the UMB-ID, by deducting 1.
Example: UMB-ID: 1
NMEA-ID: 0
20.5.3 Summary of NMEA commands
Telegram request NMEA / VDT
Independent telegram transmission NMEA /
VDT
Access mode (read only/admin)
Control line trigger property
Switches to binary protocol
Differentiation is made between 2 authorization levels when sampling:
- Read only and
- Admin
The settings for all parameters can be requested in both modes but can only be changed in
“Admin” mode. In “Read only” mode it is only possible to enable/disable automatic telegram
transmission and to trigger a software reset.
20.5.4 Telegram Request (NMEA)
Description: This command requests the NMEA telegram.
Request: <ID>‘TR4’(CR)
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