Operating Instructions
Smart Weather Sensor
G. Lufft Mess- und Regeltechnik GmbH, Fellbach, Germany
75
19.5 Communication in Terminal Mode
It is possible to communicate with a device in a very simple text-based manner using the
terminal mode.
To do this, in the device configuration, interface settings, the protocol mode must be set to
terminal (see page 31).
Note:
In the case of communication in the terminal mode, only one single unit may be
connected to the interface, as this protocol is
NOT
network-compatible. It is used for very
simple measurement value requests.
Note:
The use of binary protocol is recommended for lengthy transmission routes (e.g.
network, GPRS/UMTS), as it is not possible to detect transmission errors in terminal mode
(not CRC-secured).
Note:
In the terminal mode, measurement values are not available in all units. Furthermore,
status and error messages are not transmitted.
19.5.1 Structure
A terminal consists of an ASCII character and a numeric character. The command is
completed with the <CR> sign. There is no echo on entry.
The individual values in the response are separated by a semi-colon (;). The response is
completed with <CR><LF>.
An invalid terminal command is acknowledged with ‘FAILED’. Control commands are
acknowledged with ‘OK’.
The command to which the response relates is given at the beginning of each response.
Note:
No response times are specified in the terminal mode.